"When I asked Pavel if Mopar cited any specific data in denying his claim, he stated, "No, they just went by the load capacity of my truck.""
Sounds like some very specific data...
Also, the rear axle rating is probably 9750, and the backend of that truck already weighs a good 3500lbs. Add in a 6500lb camper and you're beyond axle limit. Plus the weight being so far back is probably equivalent to 2-3k pounds of tongue weight on a trailer, which would make no sense for a truck like that. When I was truck shopping, I skipped right past 350s/3500s because they generally had about 5k payload capacity. The 550s/5500s are north of 10k payload, and the frame is in excess of 12" tall, 3" wide and about 3/8" thick at that critical stress point.
View attachment 388650