Originally Posted by captishmael
I built one (actually a series of 4). I used black iron pipe and elbows that terminate in floor flanges on each side. Over the horizontal iron pipe, I used oversized PVC tubing. I think it was 3/4" iron and 1 1/2" PVC. It works well, is relatively inexpensive, about $100 for all four rollers. I back the whole shebang into the rio at takeout time.
Ditto, except I used 1" galvanized pipe with street elbows into the floor flanges, and 1-1/4" sch 40 PVC. I have one pipe going all the way across the back of my trailer, but cut the PVC into three sections to make straightening the raft easier. Works fantastic and there're no bearings to go bad. Be sure to deburr all the cut pipe ends.