I have an 06 Ram Hemi Quad cab auto. 2whl. dr., and I HAD a coleman pop up. When towing this, I left the trans.in overdrive without any problems.
HOWEVER; I traded in my pop up on a 08 Flagstaff V-lite, 30 footer, and it needs the tow/haul mode to pull it, as it is MUCH heavier than the pop up. I figure it's about 6500 lbs. loaded. And I live in Florida. Just got back from a 400 miler, and overdrive would bog down the motor and slowly lose speed, until i switched back to tow/haul.
/SIGPIC]'08 V-lite Flagstaff 30WRLS
'06 Ram 1500 QC hemi
Reese dual cam sway control,
K&N series 77 intake, Hellwig helper spgs. LT tires,
Flowmaster "true duals", 380 h.p., Bilstein shocks