[BadmanRick]

Sounds to me that if you are have enough money to purchase a Very Large 5th wheel you have enough money to purchase the proper tow vehicle. At least a 450/4500 or higher just to be safe.
An aluminum Ford F-150 will not safely pull a 37’ tt. I don’t care what they say the tow rating is. When you try and tow a trailer that weighs twice as much as the truck the tail wags the dog. My friend tried this combo and nearly killed himself.
Just saying. Better safe than sorry.