K1500, you are right-

If you take a look at a 1500, 4WD, crew cab eco diesel, Ram lists it with the following specs:

GCWR: 13,750#
GVWR: 6,950#
Payload: 1,260#
Truck weight: 5700#

If you enter this data into RV Tow Check, with 300# of gear on board and 400# of passengers, and a 10% tongue weight estimate, you get a maximum trailer weight of 5500# tow capacity.

That ain't much.
But, if you just want a diesel and don't really plan on doing any real towing with it, I say go for it!!

I'd rather be a free man in my grave, than living as a puppet or a slave....