Cummins12V98 wrote:
Honestly wind resistance does matter as my rig is 101" wide and 13' 5" tall. But weight is a biggie as the grade increases.
For sure they both limiting factors. What I'm getting at tho, I've towed an 8,000 pound open trailer with a tractor on it and towed easier than a 6,000 travel trailer. Too many of these tests, they just put weight on an open trailer and there much less wind resistance than a fifth wheel or travel trailer. At lower speeds of course weight is more of a factor. But at 60, wind resistance seems to be the bigger factor.