They aren't bolted to the frame or floor. They have about 3 inch long wood screws (and glue) through the floor and into the 2x joists. Not sure if thats 2x2 or 2x4. I use a wheel chock, not much upward force on the D rings where the wheel chock is.
2013 Cherokee grey wolf 25rr
06 F 250 5.4L gas
03 Honda vtx 1800c
As others have said lift the front of trailer up to make ramp flatter. and watch the ramp for sag in the middle we saw this after just loading the bikes 4 or maybe 5 times, a compression rib rite in the center, camper is at dealer getting a new door. with exception of tires that the only thing we have had problems with, pull it with our yukon and it trails straight. other wise we have no complaints about it.
I found out the two front tie downs on my 19WP are held down with 1/2" wood screws the other 4 look to be held down with bigger screws. I would still like to know how they are bolted down. I had tie my bike down with the front two and the back tie downs, the front broke loose luckily I only damages on cabinet door. I don't understand why they don't say something about the rating on the tie downs.