Cummins12V98 wrote:
Old-Biscuit has it right. You will most likely be over your rear tires carrying capacity.
A 16K 5er and yours will easily get there will have a minimum 20% 3,200# pin and easily up to 25% 4,000#.
So now you have a choice of blindly towing it like most will do or installing a set of much higher load range "E" tires from a new RAM or 19.5 tires and wheels or better yet get a truck that the new RV is within it's ratings.
Of course all JMHO!
First off do you know if he has E rated tires at 3195 or 3640. My previous truck 99 Superduty 350 came stock with LT265/75/16 E rated at 3640 My current truck 2014 Ram stock is LT 275/70/18 E rated at 3640.