I have the chev 3500 ( 2006 pleasure-way lexor TD).
6.0L 305 HP..about 315 max torque.( the 6.0 came in different versions depending on use...the escalade gets 360 peak HP, less torque I think)
the van weighs over 8000 pounds.
rated tow capacity per manufacturer is 5000/500.
this is the 3 spd w/OD 4L80E tranny
the drivetrain is bulletproof- millions of these vortecs on the road.
gearing is good for pulling and mountain use.
hwy mpg ( no tow) is about 15~16.
to pull a toad, I'd want to have a braking system.
may be a benefit to have both vehicles use same type of fuel.
Mike