I have loved my 2011 Ram 3500 for hauling and towing our camper and toys. Diesel, Crewcab, dually, longbed, etc....55K miles and going great.
Honestly if I was you, I would go test drive all 4 brands: Chevy, GMC, Dodge/Ram and Ford. If you really might upsize your camper I would just be looking at duallies then...usually if you go in test driving new trucks the dealers also have a few newer used ones too.
I would further suggest if you can swing a new truck, pick one you like and do a factory order. That way you get what you want and need and not paying for stuff you don't want.
2016 Dodge Ram 3500 CC Dually Cummins,Aisin,Laramie,4*4,4.10,14K
2017 Stealth WA2916 Toyhauler
2011 Arctic Fox 1150 Drybath
2017 Polaris 1000 XP Sportsman
2009 Polaris RZR w/fun parts
2014 Polaris 850 HO Scrambler
1977 K5 Blazer 1ton'd
2005 Pace Enclosed Toybox