I used rubber gasket from a garage door on the bunks. I wanted more surface contact than 4 pucks and my bunks are already above the wheels. Mounting to the trailer was a breeze, mostly because I had 4 helpers to center it on my marks. Then I drilled down through predrilled holes in floor, through aluminum bunks and bolted. Took less than an hour. Now I can push it around to clean and move stuff around garage. Easier to get inside and work too.
Pile of parts and materials is getting pretty small, a true sign of progress.