Bob
At nearly 900 lbs the Harley weight is displaced at the front and rear tire obviously. The chock displaces and distributes most of the front 400-500lbs but the rear tire and it's 400-500 lbs contact patch is only a few sq inches. The floor decking is ony 9/16" OSB. I wasn't comfortable with the condition plus the floor bowed slightly from the rear tire weight the first time we loaded the Ultra. My dealer also laughed when I told them what I did too by blocking the motor and the plywd under the rear tire. Others on the forums recommended the blocking and plywd in the toyhauler area. Sure its overkill but I plan to have this rig for a long time. I glued foamed backed carpet tiles (foam side down) under my rear plywd. It never moves. You can ride right over it. I've done it so many times I can be loaded and strapped down in 15 mins-all by myself. Good luck.