I finaly got to run across a scale with the camper. With camping gear and 100 gallons of fresh water and maybe 200 ~250 lbs of tools in the bed of the truck I am 400 lbs over the rated rear axel load rating with my single rear wheel 3500 (7050 lbs limited I am sure by the tire rating ) I am still under the trucks max tow combine rating . So I think we will only travel with 20~30 gallons of freshwater and I am going to swap out to 245/70/19.5 load range H tires rated at 4950 lbs and custom wheels. these tires on all 4 corners even running at reduced air pressure have a big margin of safety and much more stable side wall .
the weights as loaded this day are
front axle of the truck 4870 lbs
rear axle of truck 7420 lbs
trailer total of both axels 12910lbs inc 100 gallons of h2o
25200 lbs total combine
It pulls it fine but the tires on the rear axle are over weight so keep this I'm mind for those of you who are looking at trucks and thinking a 3/4 2500 HD is enough.
my combo is:
2016 GMC crew cab 3500 denali single rear wheel 6' bed 4x4 ,6.6 duramax Allison , demco slide hitch and air bags
2015 Redwood RL-38 with washer drier , king bed super slide , slide toppers , two awnings ,120v frig, dishwasher and a full basement of tools , cleaning supplies and Gen prep . I know I could take a easy 200 lbs out of the hitch weight with taking things out the basement that are not needed every day but that is not how most of us travel.......