After reading all of this and talking to three different people at DRV, I installed an Overbilt lift on the Mobile Suite 36TK3 last May. I'm carrying a BMW F650 CS, about 425 lbs. I added 300 lbs of gravel in storage tubs to the front of the storage bay and my blowup kayak (50 lbs) on top of the tubs. Have taken the bike from Michigan to Melbourne Beach, FL by way of WV/NC (I-77) and back by way of TN/KY (I-75). Also made a couple of trips up north in MI. Total fifth wheel weight with water, propane, gravel and all the stuff we haul (my wife does not believe there are grocery stores outside of MI) CAME TO 19,300 with pin weight of 3,600, about 18.6% of total. While a 20% ratio is considered ideal, this should be close enough. I think the air bags on the trailer do moderate the up and down shock to a certain extent. There is some chucking but I had that without the lift installed. This TrailAir pin box doesn't seem to be as good at eliminating chucking as the Demco Glide Ride I had on my prior fifth wheel. It seems to me if there were any frame distortion happening due to the M/C and lift, my slides would let me know in a hurry. I would be interested in finding the best, most cost-efficient NDT method for determining whether flexing is causing frame damage.