Just to add to the conversations, here's how I added my extra plywood to the 3602. I cut a 3/4 inch piece of marine plywood such that it fits right under the hinged door when vertical. The plywood was cut to also allow the rear tire to sit on top of the plywood.
Two nuts you do not see, are below the plywood, holding the 3 inch bolt to the floor, and the nuts you can actually see in the photo, are holding the plywood down. The large bolt is secured to the existing floor, and the top portion of the bolt, holds the plywood.
When the bike is not in the garage, I un-screw the top bolts holding the plywood (hand tight only), and lift the plywood off the bolts, and place it vertically against the back door. I use two large paper clamps to hold the extra plywood vertically right under the hinged back door ramp.
I also have a rubber exercise mat that I use beneath the plywood, and when the lounge is down, it serves as a nice rubber carpet in the garage.
I guess those who have the 3602 MUST add the extra plywood. No questions asked
By the way, those tire marks that are making the V shape, were when I did not have the bolts installed. As I pulled the bike out, the wood would come with it, out the back door and turn sideways.
So Fred, you had your rear tire break the floor?