Same here except I run a 3505' warrior .
Me personally I'd go 37-38 but 40& not something I want to worry about while going camping, besides if you want to take it other places like mountains or wherever, national parks , they can get to be to big of a rig.
I just put a full set of the stage 4 EBC brakes on my wife 4 runner, man what a difference. My truck stops just fine , the triples on the trailer work great as well. but next brake job , I'll be looking to upgrade them to aftermarket possibly. If your dodge doesn't have an exhaust brake it's a must have. I always run 16" E rated truck tires, never ever ever would I tow anything that size on those 15"' slime ball or Carlisle whatever bullshit rating they say in the ad trailer tires .' I've seen guys bout los
e their rig from highway blowouts.