Yea me and a friend did some numbers last night of what we might be looking at for instance:
2018 ram 3500 SRW mega cab with aisin
payload: 4,060LBs if i remember right
Max tow: 16,600LBS
so to me that would be tons of payload even with two adults, two kids. And would sufficiently handle the camper itself. Also have a buddy that owns a high end diesel performance shop, if i remember him telling me correctly a 2018 ram 3500 srw and drw have same brake package and axle, the only difference is the two extra wheels, and spring pack