[beeje]

Originally Posted by Gary-Alberta

Might as well add a contrary opinion. I had my 2015 GMC 2500 diesel when I bought my 2018 Montana 3120. To my knowledge, the difference between GMC 2500 and 3500 is rear springs, tires, wheels, only.
I wanted the shortest truck I could get because I only pull the trailer for about a dozen days per year. I pull from Canada to Arizona, 1750miles in 4 days, then the trailer is parked for 3 months before I head back. For those three months, I use my truck to go shopping, golfing, sight seeing, etc. I don't want a dually for that.
I upgraded springs, tires, wheels to 1 ton spec. I am completely satisfied with every aspect of the towing and truck usage that I have. The truck is double cab, standard box, and fits inmy garage at home too.
Consider all your requirements, not just the TOW.

I understand wanting to use the truck that you already own to tow a camper. What I do not understand it the total lack of caring about matching your tow vehicle to the camper you want to tow. Your 3120 has a GVWR of 16000lbs. WELL beyond your trucks cargo capacity (which I guess to be around 2000lbs, (check the drivers door yellow sticker ). We are talking more that double its capacity, not just a little bit.