Trailer rocks when towing over uneven road surface- time for new springs or? - Page 2 - Fiberglass RV


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Old 11-12-2015, 03:13 PM   #15
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Trailer: New owner of a 73 Hunter compact ll
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the question is not how fast but how bad the california roads can be. I was stayin alive at 55. but the trailer was basically empty. justbsome clothes fotnthe weekend and a case of beer. I went to the Stranded in Morro Bay vintage trailer gathering, they provided bfst dinners happy hour and entertainment. I didn'tneven have water on board.

so combination of soft sidewall tires, heavy fridge on pne side higher up, and possibly shackles, bushings and springs, whew.. the to do list lengthens, I just making sur to be safe when towing. then i can srart testing the wiring fornthe 12v system. right now i am trapped by elctric or a generator.

work is getting in the way of projects. i hate when that happens ��
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Old 11-12-2015, 06:50 PM   #16
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Cathie.

Start off with a set of "ST" trailer tires and see how it goes.

"ST" tires are made for trailers and as RodgerDat says they have stiffer sidewalls.

May help your bouncing and new tires are always a good thing.

Joe
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Old 11-15-2015, 10:53 AM   #17
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The spare tire should be replaced too. A 40-year old tire is such a hazard that you'd be better off to not even carry it and thereby be tempted to use it. If you would like more information on that subject, Google "old tires dangerous" or similar.

Tires have a manufacturing date on them. That may be informative to check. It's recommended to not run them for more than about 7 years regardless of tread remaining.

Any play in the frame and suspension (worn springs, shackles, bushings, insecure mounting to frame, frame damage due to rust, etc.) or play in the axle bearings can amplify bounce or sway. The tire rubbing the wheel well may even indicate a second, separate issue. RogerDat's experience with a broken pin is illustrative.

A mechanic or tire shop or even a mechanically-inclined friend should be able to review all this and give you a solid reason for each of the problems you are seeing.

And, no coffee at camp is just too horrifying for words. If only my eyes could "un-see" that part of the post.
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Old 11-15-2015, 02:42 PM   #18
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We are heading home this afternoon from a week in Yosemite with our Hunter and, on some of the unimproved roads we have been on, a lot of side to side rolling seems about normal for the Hunter. That you have removed some of the weight might make it bounce around more on even less rough roads. By all means, check everything for security, springs shackles etc.


But, moreover, Toss that spare before you attempt to use it. It could fail within minutes of being used, leading to significant trailer and possible collateral damage. Then check the dates on the tires on the road, anything over 6-7 years old should be tossed and replaced as well.


(Apologies for the 3 hour delay in posting, I forgot to send.


On the way up here last week we came across threads of tire casing on the highway and, a few hundred yards further down the road, an older single axle sticky with no left tire and horrendous damage to the left side of the trailer where the tire came apart and took part of the trailer with it. This is not untypical of an older tire failure at 55 MPH. Fortunately no other vehicle involvement or injuries were a result, but it was the perfect storm for the worst case.
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Old 11-16-2015, 10:01 PM   #19
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Smile

thanks to all of you. I am know well versed in identifing size, appropriate pressure and age of tires. I am lucky to be safe after my first outing. Before I left I checked the lights and the pressure, I couldn't find what max pressure should be on the tire, i assumed they would be the same as a car, so 35 psi it was, i drove slow. Once again, I took the word of the po that he had replaced the tires 4-5 years ago. gatage stored and the tread looked good.

Unless he purchased them at an antique store he was blowing smoke. I squiggled under the trailer cleaned the sidewalls took a picture of the "code" (when did writting get so small?)

The 3 digit code says it was made in a decade in the 1900's that ends in a 4. So 1994, or 1984 . They say there is a triangle with the code if it was the 90's. Arrrgh... I am afraid to pump the tires to the 55 psi.

I had to search for a familiar size, i'd never heard of B80-13. I have a new set on order! What an opportunity to sand and paint the rims ... sooner than planned but what are plans when your project is a work in progress

Thanks for all the great advice!!!
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Old 11-17-2015, 05:22 AM   #20
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Cathie, as you've found out the sizing for tires has changed. If you bought "new" B80-13s, they're going to be OLD... if in fact that's what they are. Be absolutely certain to check the born on date before you have those tires mounted on your newly painted rims.


Best of luck!
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Old 11-17-2015, 09:29 AM   #21
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I have ST175/80R13, Load Range "C" tires on my Hunter.
Look at the max pressure indicated on the sidewall. 50 PSI will indicate that it is a load range "C" tire. The ST indicates that it is a trailer tire.
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Old 11-17-2015, 09:49 AM   #22
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The fact that the tire has contacted the wheel well indicates a suspension problem . It is obvious that you need tires as well . The tires should be inflated to the recomended pressure as to tire size and weight of trailer .
There should be a label , usually inside a closet or cupboard door , that lists the tire size and proper inflation . There is also a chart on the net if you google 'tire pressure chart' . As an example my Surf-Side tire pressure is 20 lbs. both on the label and on the internet chart . I run at 25 lbs to account for contents of the trailer. The trailer rides great and tire wear is even . Inflating to the maximum pressure would cause all kinds of trouble.
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Old 11-17-2015, 10:57 AM   #23
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Quote:
Originally Posted by Cathie Sadler-Pare View Post
The 3 digit code says it was made in a decade in the 1900's that ends in a 4. So 1994, or 1984 . They say there is a triangle with the code if it was the 90's. Arrrgh... I am afraid to pump the tires to the 55 psi.

I had to search for a familiar size, i'd never heard of B80-13.
Cathie,

It looks like you read the Edmunds article or similar on the dangers of old tires, investigated, and found something important, which is great news!

I grew up with "Alpha" tire sizes such as B78, G78 etc. in the 1970's. The higher the letter, the wider the tire. The current system uses P-metric and euro-metric tire designations such as the ST175/80R13 that Bob mentions. So, suffice to say you had some really old tires.

Opinions vary on the pressure to maintain in your tires as noted in this and likely many other threads:

http://www.fiberglassrv.com/forums/f55/surf-side-tire-pressure-70771.html

I am relatively new to towing and am on a learning curve. Personally, I am currently maintaining pressure at 10 lbs above the "load-rated" pressure Goodyear cites in the below-link. In my case this is 40 + 10 = 50 pounds, which also happens to be the maximum pressure for my ST205/75R15 Marathons.

http://www.goodyearrvtires.com/pdfs/tire-care-guide.pdf

One reason for the shift in my approach since the July thread is that my tires will likely "age out" before tread wear ever becomes an issue. I also reason that the additional pressure should increase stiffness, reduce sway, and allow for higher-than-expected loading.

In any event replacing all three tires with fresh, new ST (= Special Trailer = stiffer sidewall) tires will be a critical step here.

http://www.tirerack.com/tires/tirete...jsp?techid=219

Finally, while it's great to say 'Eureka, I have found it!', please consider that there may be multiple issues and have the frame, suspension and bearings thoroughly checked out too.

After you have resolved these critical safety issues, you can then apply some attention to the almost-equally-critical issue of how to arrive with proper coffee gear.
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Old 11-17-2015, 11:22 AM   #24
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Tire pressure/size recommendation labels inside any trailer more than 10 years old are reflective of the tires available when it was made, and often do not reflect current tire designs or pressure/load requirements.


The commonly used ST175/80R13 tire size found on many Scamps, Surfsides, Hunters etc didn't even exist when many of these trailers were new.


For example, if you mounted a new ST175/80R13, load range "C" tire, which is rated at 1360 lbs capacity (cold) @ 50 PSI, and used a trailer manufacturers chart value of 20 PSI, you would be reducing tire capacity to 795 lbs, perhaps under the capacity needed for many 13' FGRV's. In addition, as there would be more sidewall flex, you will also increase tire heat generated.


I set my ST175/80R13's on my Hunter at exactly 50 PSI cold (per tire label) and it tracks like it is on rails for at least the past 8000 miles I have put on these tires in the past 6 months.


Here is a tire pressure vs load chart for ST tires
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf


For Bob in Mb: And, while over-inflation can lead to additional tire wear, I don't know of any creditable source that suggests that running ST tires on trailers at the maximum indicated tire pressure (cold) will lead to additional tire wear or "cause all kinds of trouble". Please explain....


While checking for loose suspension components on a used trailer is always a good idea, tire/wheel well contact in a Hunter can also be caused by incorrect tire size or excessive load.
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Old 11-17-2015, 01:39 PM   #25
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Wow Tires are a hot topic! I was shocked at the age of the existing tires. I do think the under inflation was a huge contributor to my unusual rocking. While the wheels are off will be the perfect time to check and replace original bearings, shackles and springs. I am lucky to have a neighbor who is well skilled as a mechanic, he just doesn't know I'll be consulting and hiring him ... Yet😄
So only driveway camping for me right now. It's so cold I'm almost considering reinstalling the duo therm heater that's sitting on the garage. Ok cold for so cal- not real winter.
When's the next gathering I need a goal to finish and meet y'all!
Bummed I missed lake casitas- next year.
Bee Happy
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Old 11-17-2015, 02:07 PM   #26
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Quote:
Originally Posted by Cathie Sadler-Pare View Post
Wow Tires are a hot topic!
Yes, that's all well and fine, but the coffee Cathie, what about the coffee?
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Old 11-17-2015, 02:13 PM   #27
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There is one in april /may near king city @ san lorenzo reg park
Email marianne dinsmore
Marianne.dinsmore@gmail.com
For details
We just made our 3 night resv for apr28 thru 30th
I m sure it is listed in forum under rallys
Hope to see you there


Sent from my iPhone using Fiberglass RV
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Old 11-17-2015, 02:56 PM   #28
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Yes, that's all well and fine, but the coffee Cathie, what about the coffee?
That was the first problem that needed immediate! attention. Bought an old school percolater coffee pot. Not electric - If you take out the coffee insert it also works as a pot to boil water and to make hard boiled eggs. Nothing comes onboard that doesn't have more than one duty. Coffee being the beginning of All Things!
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