Re: Anybody know a source for bunk roller assembly like this?
No, that one won't work. That particular variety is available all over the place (I think my local sporting goods store even carries them), but it's designed for a frame member running fore-n-aft. I don't have a fore-n-aft frame member on my trailer - only cross-beams. But I can't seem to find an adjustable roller that's made for cross-beam frame members, except for the low-profile bolt-on numbers, and I don't think they'll go up high enough to work for me.