We did one of these for a customer who bought a swim spa from the traveling master show. I won't go into the details of how terrible their service from master was, but she ended up coming to us to solve her problems. One of the problems is that the cover was too difficult for her handicapped husband to remove and they don't have the clearance for a lifter or other automatic cover system. After some research, I found roll it covers.
They aren't really set up well to sell through dealers. I think they basically sell to dealers for $300 less than they sell them for online. Not a lot of room for profit there. Anyway, in order to take care of this customer we got them one and installed it. It has worked well for them. FYI, to make it light enough for elderly or disabled customers, you need to request that the frame be made from aluminum instead of their standard frame material.
*It has been awhile since this occurred so I may not have given totally accurate information here.