2011 Ford F150 and Travel Trailer

I agree with you Barney, frontal area makes a big difference and I was remiss in not including that. For example it is much easier towing a boat than a TT. Just mentioning that TTs are expected to have 10 to 15% whereas manufacturers specs often assume 10%. My current setup is closer to 15%. Therefore would recommend getting the loaded rig on the scales so real numbers are available and then the math is easy.

Good luck,
Stu