Re: 31Red
Payload is the problem towing 6500-7000 pounds is the Crewmax which has 1200-1400 pounds available. Assuming based on the model that you do not have a large family to take, keep the truck bed empty and you should be fine. Plenty of power with the 5.7L and 4.30 gear.
I will warn you the 31RED is a low model, 2-entry step model like mine. Navigating some driveways can scrap, even with my 3' shorter TT. I really like the RED floorplan, though!