How much of a tow weight margin is best? - Page 2 - Fiberglass RV


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Old 06-20-2007, 04:06 PM   #15
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Always keep in mind that the RV salesman will tell you the truck you already own can pull it and the truck salesman will tell you the truck can pull the RV you already own. I've had RV salesmen look out the window at my pickup (rated to tow 2,000 lbs) and tell me certainly it could pull the 3,500 lb RV...

One prime reason for the 75% Rule of Thumb is that towing capacity may diminish significantly with altitude. My 98 Ford Ranger's manual states that towing capacity should be reduced by 2% for every 1000' of altitude....
Well, that is some consolation for not being able to get the 21' BF trailer into our carport. And I do care that we have an adequate safety margin and enough towing power at higher altitudes, because we will be taking our trailer or fifth everywhere--Flagstaff, White Mountains, Utah, Colorado...whoohooo...now we just need to get the darn thing! And the truck.
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Old 06-20-2007, 05:10 PM   #16
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One thing that the salesmen may have been alluding to is that some manfs spec the axle (which is generally on what the GVWR is based) with plenty of capacity above the dry weight of the trailer and others spec it to be much closer to the dry weight. This is likely what they were talking about. Without some scale weights of real rigs, it's hard to know what the personal load capacity actually is.

Without getting actual scale weights (hopefully with all travel gear and fluids loaded), the next best conservative estimate is obtained by using the GVWR (the assumption here is that the trailer will never exceed that weight), plus a 15% estimate for the tounge weight (TW is seen as a load on the TV, whereas GVWR is seen as towed weight).
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