Which Truck?

Get a 2500 Ram and tell her it was to give her what she wanted and a better ride.

2500 Rams are coil rear suspension and worthless for carrying campers due to the bounce and sway.

I have 65k miles with over half hauling my Lance 815 on my Ram 3500 with 6.4 gas engine. Love it and don't miss the 5.9 diesel I had before because I'm not towing heavy like I did in the past. Average with the camper running 64 has been 12.4 mpg so not bad. The 6.4 is a much better engine than the 5.7 as it's designed to tow. I did go with the 3.73 gears but next one will order with 4.10 gear. Don't just look on the lot, look at ordering one to get exactly what you want. The cost for me was only going to be a couple hundred more for custom order so I only paid for what I wanted.

The truck handles the camper very well without any mods except for the tie down and a heavier charge circuit as I boondock a lot and wanted a 20A/hr charge late as I drive between camprgounds.

I also had an 18' bowrider I've towed behind it and just slowed down to 60mph dropping out of 6th and still managed almost 11mpg on that trip. The heaviest I pulled was a u-haul trailer with my daughter's camry and that is about as much as I would want to push the truck on a regular basis, but then again, I do have the 3.73.

We often go the Blue Ridge Parkway which means 5,000' and haven't found a lack of power then either. Haven't had the chance to get to 10k' though, but from past gas experience at those altitude, I'm sure I'll have plenty of power.