Ordering new Ram

Dual alternators has no downside other than a slight cost increase. You won't see much benefit from it if you don't upgrade the wiring to charge the camper batteries. I would at least run a #2 from the main battery, thru an isolator, to the camper connection. You'll need to then change to a #8 or so if you want to use the normal 7 pin plug. An even better solution is to make your 12v + and - connection using a large Anderson style plug or the kind used by tractor-trailers for lift gates. This will allow you to keep the #2 wire all the way to your camper batteries. This would allow you to run the refrigerator on 12v while traveling to save on propane.
Otherwise, how do you use the truck? Personally I install lots of amateur radio transmitters, stereo amplifiers, inverter, air compressor, etc. into my work trucks. This makes the dual alternators very appealing.