Joe look on craigslist they sell that stuff wholesale all the time. Sorry web search required.
BE careful picking it up we had a Marine shot and killed a few weeks back for a fake Ipad purchase. Two punk kids killed a man for $400 dollars. Guy does his duty and the grime he was serving take his life. Sad story.
We use a belt over roller unit for moving rugs between floors. Daily use for 15 years with no maintenance issues. It's bigger than what you want and isn't meant to be used in a wet area, so not the answer for you.
If you don't want to search, give a local material handling company the parameters and let them do the work.
PS: I think you have the right answer to loading, one that the purveyors of centrifuge ringers might want to look into offering.