I have a 16x32 cover that I roll on a long 2" PVC pipe. When done for the season I prop it on end against the house for a few days to let it drain, then hang it from the rafters in the basement. I have 4 suspension points for nylon straps and to distribute the load even more so as not to damage the bubbles, I made some cradles for each point, about a foot long from strips of plywood then covered with heavy cardboard that the rolled cover rests in. I can take some pics if it would help.
Al