Gary, how about a Toyota Tundra?? On several other forums their owners seem the think they can tow anything out there with them, and don't try to tell them different or you'll really get bashed.
On a serious note, since the FB is very close to the RL, I would go anything less than a 1 ton dually because I know we're approaching the limit of ours.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top