Our Yukon has air shocks coupled with the max tow package springs. It helps a lot to keep everything level and load secure. But as far as weight distribution, there is none. We still had a pin weight of ~600 plus gear overtop the rear axle. Tow rating is ~8,000lbs and hitch is rated for 1K pin and 10K pull.

I bought a Curt Rebellion cushioned hitch for the trip and future towing needs I can swap between wife's rig and my truck. It worked great over bumps/dividers in the highway, it also reduced banging when going up and down the mountain roads. It is rated at 10K with 2" and 15K with 2-5/16". I got the turnover style so I have both for each trailer setup.