If a dually is barely enough truck, maybe you should look t a tandem rear truck.....if one can not have too much truck any how!
Ryder and Penske have MDT's. BUT, issue with many of these, they are speced HP wise from a enough power to move the truck at gvw only. Rarely do they have powerplants for true towing power. Chassis wise they are fine. But usually with a 250-300 hp motor, possibly in the 200-225 relm too vs wanting a 350-400hp motor for true towing at the gcw that the chassis is capable of running at.
marty
92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
2014 Chevy 1500 Dual cab 4x4
92 Red-e-haul 12K equipment trailer