Smoothing out my bumpy ride - Page 2 - Fiberglass RV


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Old 06-01-2015, 05:47 AM   #15
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When I first picked up the trailer the tires were soft and the ride was really terrible. The tires are actually rated for 90 PSI (I think). They are wee 12" tires. Seems I could only get about 70PSI out of the compressor I used to top them up. I should check where they are at now. They look firm but might still be relatively soft.
Thanks.
We use 38lbs in the tires on our trailer and the ride is creme de creme. Most folks find that the higher the pressure, the rougher the ride gets.

Shocks installed on the trailer will make a huge difference.
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Old 06-01-2015, 06:30 AM   #16
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I have a "Hitch vice" to take the play out of my receiver and stinger.
http://www.hitchrider.com/nowobble.htm
I've only found it online.

Joe
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Old 06-01-2015, 06:39 AM   #17
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Trailer: 2014 16 scamp side dinette/Rav4 V6 Tow pkg.
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Thanks for this. I'll do a little investigating.
Had the same 2 part hitch on my rav4, but have it at a rise instead as a drop. Made a heck of a lot of noise but not a bumpy ride. Got a one piece cushion hitch and a 1" rise ball to get my height, also the anti rattle bracket as shown above in the photo. Helped a lot. Carl
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Old 06-01-2015, 10:30 AM   #18
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From what I have read, tires should be inflated to their max.
That's a very common misconception. Tire manufacturers publish charts and tables of pressure vs load. For Example.

Trailer Tire Load/Inflation Chart | Maxxis Tires USA

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Old 06-01-2015, 11:51 AM   #19
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Tire Pressure

I agree Walt. I worked for two tire companies and the word was to adjust tire pressure accordingly to the weight the tire was carrying.

Generally speaking having a tire inflated to the max and the trailer weight is under the max rating it will tend to ride hard and wear down the center of the tire tread.

PS.... If there is a tire company that recommends inflating the tire to max pressure even thought the weight is less then that is something else again.
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Old 06-01-2015, 11:57 AM   #20
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This is correct as the air support the weight and the plies (etc) serve to hold in the air. Thus the different air pressure ratings per rating class of tire.

LT-Metric, LT-Flotation and LT-Numeric Light Truck Tires
Load Range Ply Rating Abbreviated Maximum Load Pressure
B 4 B 35 psi (240 kPa)***
C 6 C 50 psi (350 kPa)***
D 8 D 65 psi (450 kPa)***
E 10 E 80 psi (550 kPa)***
F 12 F 95 psi (650 kPa)***
***Selected large LT sizes are designed with reduced maximum load pressures

ST-Metric Trailer Service Tires
Load Range Ply Rating Markings Maximum Load Pressure
B 4 B 35 psi (240 kPa)
C 6 C 50 psi (350 kPa)
D 8 D 65 psi (450 kPa)
E 10 E 80 psi (550 kPa)
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Old 06-01-2015, 06:11 PM   #21
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That's a very common misconception. Tire manufacturers publish charts and tables of pressure vs load. For Example.

Trailer Tire Load/Inflation Chart | Maxxis Tires USA

Walt
From Weighing your RV - Goodyear RV ...

"Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up."

I AM trying to "resolve poor ride quality" so I guess I should adjust the pressure...
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Old 06-01-2015, 06:57 PM   #22
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I saw this on Amazon and bought one for our hitch. We used it towing the Scamp from New Mexico to Denver without a single problem, but in bringing it from storage to the house this past weekend, we didn't put it on and it felt like the Scamp was bumping and banging around behind us. In reality it was the hitch making noise and allowing play. Put this gizmo back on the hitch to return it to storage, and it was once again a smooth, quiet ride. Might be worth a try as well.

Amazon.com: Roadmaster 061 Quiet Hitch: Automotive
This intrigues me although the cheap me is having a hard time parting with $25 for something that looks so simple. And I actually could use two, one where the hitch enters the receiver and one for the adjustment point on the drop hitch.
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Old 06-01-2015, 07:00 PM   #23
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From Weighing your RV - Goodyear RV ...

"Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up."
This statement is true but anyone who has driven a vehicle where the tires are over inflated knows how unstable it can become. Have you ever driven a Corvair with 26 lbs* of air in the front tires? The car is all over the road.

Note the factory spec for Corvair front tires is 14LBS.
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Old 06-07-2015, 07:02 PM   #24
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As a follow up to this, I replaced the rattly adjustable ball mount with a fixed 8" drop and added a quiet hitch clamp. I also measured my tongue weight at 195#, which I think is just a bit light, and moved some stuff forward in the trailer to compensate. These things have made a big difference. I found it was a much better towing experience this weekend. Still thinking about tires. I'll update if I make any changes there.
Thanks!
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Old 06-07-2015, 07:15 PM   #25
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Remember one thing folks, if you're running 14" or 15" tires, you may be giving advice for those. Kyle is running 12" tires! Kyle, what does the sidewall say for PSI? It's Frederick's birthday today, but I'm betting he's got some tips and tricks that would help. You probably won't hear from him today however
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Old 06-07-2015, 11:04 PM   #26
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So glad to hear that it towed better after making some adjustments!
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Old 06-08-2015, 06:07 AM   #27
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I've been reading this thread and the tire pressure discussion interests me. I bought my scamp 13 standard last year and tires were supposed to be inflated to 50 pounds, according to decal on my scamp (2012). Always found ride too bouncy last year so am going to try 40 this year? I don't put much of anything in trailer aside from normal food and junk that doesn't weigh much under the bunk seats. I have new tug this year: a2007 chevy express 1500 high top wheelchair van with a v6. Sold the truck to have one vehicle as my bro is brain injured.


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Old 06-08-2015, 06:42 AM   #28
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Just as all cars and trucks have a sticker giving the manufacturer's recommended tire pressures, so does my Bigfoot. It's 32 PSI. I run them at 40 PSI.

Walt
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