GaryB
Well-known member
Just was wondering about the formula that uses 10%-20% added to GVWR to determine the towing requirement (i.e., max tow capacity) for a tow vehicle....
Why is the towing requirement for a tow vehicle dependent of GVWR rather than actual loaded weight? Please let me explain. GVWR (or GVWR minus dry weight) is a "capacity" figure, whereas loaded weight is an "actual figure". For example, suppose Trailer X has dry weight of 6000 lbs and GVWR of 8000 lbs. Suppose Trailer Y has dry weight of 6500 lbs but GVWR of 7800 lbs. The formula I mentioned above (using GVWR) would say that Trailer X would need a beefier tow vehicle (since it has a higher GVWR) -- even though it is 500 lbs lighter (=6500-6000) than Trailer Y. So although Trailer X may be 'sturdier' since it can handle 2000 lbs of cargo/tanks (=8000-6000) instead of 1300 lbs for Trailer Y (=7800-6500), that doesn't mean that Trailer X is heavier than Trailer Y given a fixed cargo/tank load. Of course, tow vehicles don't care how "sturdy" a trailer is (based on GVWR), only how much the loaded trailer weighs (based on dry weight + cargo).
In summary, what I'm asking is - for a fixed cargo load, wouldn't the trailer with a higher dry weight need a beefier tow vehicle, as opposed to the trailer with the higher GVWR? If so, would it be a better indicator to inflate "dry weight" by a certain percentage rather than "GVWR"? The reason I ask is because I've noticed that some trailers have a higher dry weight but a lower GVWR than another trailer.
I'm probably making this way too complicated. It's getting late now and I'm starting to confuse myself!
Gary
Why is the towing requirement for a tow vehicle dependent of GVWR rather than actual loaded weight? Please let me explain. GVWR (or GVWR minus dry weight) is a "capacity" figure, whereas loaded weight is an "actual figure". For example, suppose Trailer X has dry weight of 6000 lbs and GVWR of 8000 lbs. Suppose Trailer Y has dry weight of 6500 lbs but GVWR of 7800 lbs. The formula I mentioned above (using GVWR) would say that Trailer X would need a beefier tow vehicle (since it has a higher GVWR) -- even though it is 500 lbs lighter (=6500-6000) than Trailer Y. So although Trailer X may be 'sturdier' since it can handle 2000 lbs of cargo/tanks (=8000-6000) instead of 1300 lbs for Trailer Y (=7800-6500), that doesn't mean that Trailer X is heavier than Trailer Y given a fixed cargo/tank load. Of course, tow vehicles don't care how "sturdy" a trailer is (based on GVWR), only how much the loaded trailer weighs (based on dry weight + cargo).
In summary, what I'm asking is - for a fixed cargo load, wouldn't the trailer with a higher dry weight need a beefier tow vehicle, as opposed to the trailer with the higher GVWR? If so, would it be a better indicator to inflate "dry weight" by a certain percentage rather than "GVWR"? The reason I ask is because I've noticed that some trailers have a higher dry weight but a lower GVWR than another trailer.
I'm probably making this way too complicated. It's getting late now and I'm starting to confuse myself!
Gary