There's a lot of people here using Class 8's to tow the really big FWs. The favorite seems to be a Volvo with 500k+ miles. Used to be, you could buy one for less than a new 350/3500 1 ton pickup. Most people modify them to a single axle and sell off the spare to recoup a bit, like upwards of $10k USD, from what I've heard.
Lyle
2022 GMC Sierra 3500 HD Denali Crew Cab 4x4 Duramax
B&W OEM Companion & Gooseneck Kit
2017 KZ Durango 1500 D277RLT
1936 John Deere Model A
International Flying Farmers 64 Year Member