Here’s my 1 cent worth! I love them, owned them, own one. With that said the one I own is a ZR2 Colorado. The camper sits on my 15 Ram 3500 Mega Cab, SRW, 6.4 liter gasser. I couldn’t ink out the cost difference! The truck reliably gets 14 mpg avg. hand calculated empty. With the 5100 lb wet camper in the back it gets between 8-11 mpg hand calculated with an average of 9.4 mpg over 5700 miles on a trip from Missouri to California. On the interstate I ran 70mph on the two lanes whatever the roads dictated with the camper on. Would a Cummins with an exhaust brake be nice, sure, but I can thumb the gear select switch to get braking and power in the hills. The 6.4 hauls my camper just fine. Now if I was loaded with money, would I get diesel to haul the camper maybe, but I would have money to burn!
