Does a lower profile tow better? NOT a mileage Question

any thing you get in the 28 or shorter model will be mostly OK behind teh f-150. The 3.5 EB is a strong engine with the main issue payload. for no more than you are going to be using the RV go with floor plan and then go camp.

if you have the same TV pulling a 30 ft airstream vs a 30 ft 5th wheel the airstream will tow better, especially in winds, and you will get better MPG. the difference is one shaped more like an airplane and other more like a brick.