Full tank to travel? - Page 2 - Fiberglass RV


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Old 09-24-2011, 08:24 PM   #15
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Typically, I travel with a sanitized and full fresh water tank. My TV will handle 2800 lbs over the dry tank weight. I'd rather have the flexibility and safety factor afforded with any extra weight of the H2O on board.

Cost due to MPG lost ... minimal. Peace of mind ... priceless.
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Old 09-25-2011, 12:08 AM   #16
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I always travel with a full tank of water. I don't think it matters that much about mpg. It could be very handy in an emergency. I take bottle water for drinking and cooking.The best way to get good mpg is to watch the speed. I try to keep my travel speed at between 55-60 and find that with my 6 speed, manual transmission Nissan Frontier 4-door pickup I consistently get between 16-18 mpg towing at those speeds. Without the trail I get 20-22 mpg. Twice a year I clean the tank with about 1/2 cup of bleach in a full tank and take the trailer on the highway to get the water to slosh around good. When I get home I drain the tank. The tank will dry and be ready the next time I decide to go on a trip. Marg
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Old 09-25-2011, 09:47 AM   #17
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Theresa P "funny/metalic taste"

To resolve water quality issues we carry water filters, sometimes one for the inlet water and sometimes one for the kitchen sink tap. The choice of filter(s) depends on where we are going and the water expectations. We have been on some spring trips where virtually every small community had a boil water warning.

As well we always carry a case of bottled water in the tow vehicle as backup for our dirt road trips and ....

We have found that filters can take care of everything, particularly the best of them.
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Old 09-25-2011, 10:03 AM   #18
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Drinking Water

In our motorhome there was a drinking water spigot. On that we used the following filter. This takes out everything. Since the water went thru the primary filter, this drinking water filter lasted about a year. We would use this water for drinking, coffee and some cooking.

It's a trully amazing filter. Because it's such a fine filter it has a low flow rate but adequate for drinking and the like.

Trav-L-Pure Camper water purifier for pop-up RV by General Ecology
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Old 09-25-2011, 10:32 AM   #19
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I like that!

Quote:
Originally Posted by honda03842 View Post
In our motorhome there was a drinking water spigot. On that we used the following filter. This takes out everything. Since the water went thru the primary filter, this drinking water filter lasted about a year. We would use this water for drinking, coffee and some cooking.

It's a trully amazing filter. Because it's such a fine filter it has a low flow rate but adequate for drinking and the like.

Trav-L-Pure Camper water purifier for pop-up RV by General Ecology
Looks like a good all-around solution. Specially if you're on an extended trip and can't carry something from home. I'm not a real fan of bottled water.
Also, I don't think a tank of water should cost much in gas mileage. If I remember my physics, a body in motion tends to stay in motion unless it is acted on by other forces. Wind resistance seems to be the main culprit. Gravity/friction shouldn't increase much with an extra hundred pounds. ....just my thoughts, any "real" physicists out there to set me straight?
Thanks
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Old 09-25-2011, 11:15 AM   #20
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Physics

I don't think a tank of water should cost much in gas mileage. If I remember my physics, a body in motion tends to stay in motion unless it is acted on by other forces. Wind resistance seems to be the main culprit. Gravity/friction shouldn't increase much with an extra hundred pounds. ....just my thoughts, any "real" physicists out there to set me straight?

Phil,

You are generally correct. The additional water weight is less than a couple of percent of the typical tow vehicle/trailer combination.

Frontal area and speed is the big deal. The loading for frontal area goes up as the square of the speed. Towing a trailer at 70 mph takes twice the horsepower of towing a trailer at 50 mph. If going 50 takes 60 horsepower, going 70 takes a 100 horsepower. One reason in the 1937 thread that those people got great gas mileage, they drove slow compared to today. 85 horsepower was plenty for them.

Physics for four years, application for life. Ayn Rand wrote only Physics and Philosophy are worth studying, or something like that.
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Old 09-25-2011, 11:33 AM   #21
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We always travel with a full fresh water tank now as we have encountered a few camp grounds with boil water advisories. We pull an Escape 19 with a GMC truck that has a large V8 so we don't even notice the trailer let along the extra water/weight.
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Old 09-25-2011, 02:50 PM   #22
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To tow or not to tow with water really is a personal decision. I suspect one of the reasons I tend to avoid traveling with water in the tanks is due to my mairine back ground. Water in ballast tanks does change a vessels stablity which when added requires a good deal of caluculations prior to filling the tanks to ensure the vessels stability was not compromised. Partial filled tanks where to be avoided due to the sloshing free surface effect in a vessel. Cant help but think that some of the same issues impact the overall stablity of a moving trailer as well.

If you add water to the fresh water tank on my trailer (its at the right rear) you will be lowering the tongue weight a lot as well as adding weight on the right axel. Which means you have to move some weight up to the front on the trailer to keep the tongue weight at a safe towing level to avoid wagging and move something over to the left axil to balance the trailer. While its true that while towing on a nice flat highway you may not notice any stablity change in the trailer but I cant help but think you might on a real curvey road or if one was to get into a really bad situation & the trailer was close to or about to tip that the sloshing of the water in the tanks might be the thing that puts the trailer over the tipping point.
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Old 09-25-2011, 03:20 PM   #23
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If you add water to the fresh water tank on my trailer (its at the right rear) you will be lowering the tongue weight a lot as well as adding weight on the right axle.
I have the opposite concern as my fresh water tank is at the left front corner, increasing my tongue weight. I fear a full water tank would push me over the tongue weight limit of my tow vehicle, so I avoid towing full as much as possible. There are some instances when it is difficult to avoid this, so I become extra vigilant about keeping my speed in check, signaling turns more than an adequate distance before I turn, and try to stay out of other road user's way.
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Old 09-25-2011, 03:51 PM   #24
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I would think any TT manufacturer who wishes to avoid law suites would engineer the trailer with both a full or partial tank of water in mind.
Up until a few months ago I had a 16' SD Scamp.
I live surrounded by the Sequoia Nationa Forest. Most of my travels are in mountainous country with either a partial or full water tank.
I load the trailer according to what fits where in the cabinets and never had a problem
A full tank of water will not slosh.
A partially filled tank of water will slosh but I have a difficult time beleiving 4 or 5 gallons of water placed in the lowest part of the trailer will create enough force to change the stability of the trailer.
I think sometimes we worry when there is no need and possibly make our new to trailering members also worry when they should be simply enjoying their new experience.
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Old 09-25-2011, 05:40 PM   #25
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Suspect most TT manufactures would argue with success that it is the responsablity of the person towing the trailer to fully understand what a proper safe stow is. One of the basics of stowing a trailer is that insufficient hitch weight or and unbalanced load will result in a trailer that is prone to sway.

In a perfect world water tanks would all be placed over the trailers axel thus avoiding some of the issues related to traveling with various levels of filled tanks - I know my tank isnt over the axels - its right at the back and off to one side.

Your correct a full tank will not slosh but in my trailers case it will add 100lbs of weight to the back of the trailer ( 12 gallon tank) which will have a big negitive impact on hitch weight - not to mention create an unbalanced side to side stow. Your also right I probable do worry more than I should about it but I dont think there is any harm in making the possible issues known to those who are new to towing. At least one new trailer from this forum has been lost due to rolling over. One only has to take a look at the Real World Towing weights to see that there are more than one or two folks towing with a trailer thats hitch weight vs axel weights would suggest it could well one day do a big sway and it may just be that 5 gallons (41lbs) of water sloshing around that gives it just enough movement inside the trailer under the wrong conditions (such as a strong side wind) to keep it going.
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Old 09-25-2011, 05:49 PM   #26
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We always travel with at least several gallons on board. More times than I can count one or the other of us has had an emergency bathroom situation.
Exactly. We haven't needed it yet, but it's good to know it's there, (kind of like pepper spray etc.).
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Old 09-25-2011, 06:08 PM   #27
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I keep a gallon or so in the bathroom for the same reason! Its nice to have when the next gas station is miles ahead.
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Old 09-25-2011, 06:22 PM   #28
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We travel with 5 to 6 gallons unless we are going to dry camp then we fill at home.

On our 13' Casita I replaced the stock tank with a 25 gal. tank I mounted under the floor. note the sight glass.

Our 17' Casita has the stock 22 gal. tank.
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