If you could go to 4 down towing, that would take hitch weight off it, then you wouldn't need new tires. If you go for new tires, you could also add Hellwig helper springs in the back. My 2017 Jayco comes standard with the Hellwigs. Or you could do airbags as well. My rig is heavy as well, so I save 300 pounds by running with very little water, just enough to flush the toilets. We drink bottled water in the rig. We don't boondock. My gvwr is 14,500 pounds and I'm never even close to it, but I don't load the rig up with tons of stuff either.