Wolf, It sounds like you got the same racks as I got on ours, 3 racks for $75 each. I hope yours works out better than ours did. Our trailer is a flat top type that has a coninous aluminum rail that runs the length of the trailer and the racks are simply screwed straight down into the rail. The first time I was going to use them I was putting a 32' fiberglass ext. ladder on it. Needless to say I leaned one end on the rack and I picked up the other end to give it a push forward and the p.o.s. collapsed,

bending forward as I was "walking" the retaining brackets over the rack. No, I did not drop the ladder on it or give a big shove, I put very little strain on the bracket. After that I put the ladder inside the trailer because I thought if they bend over that easily, I can imagine what going to happen when I have 3 of my ladders up there coming up to the first stop sign or light. Funny part is my partner was backing up the trailer a short time later and took out the middle p.o.s. with a small tree branch. Two down and one to go and they never seen anything on top. :laughing: The moral of my story is stay away from the factory cheapies and buy a good aftermarket racks.