Your asking the same questions I am trying to find answers about. try this site http://www.poolproducts.com/-i-SPL-IDE-SL2-FNM-93.htm. It's the one that has caught my attention for my wife who has great trouble lifting the cover by herself and, we don't want to block the view. The other problem I have is I only have about 15" of clearance between my deck railing and the tub. This seems to work, just don't know if it will fit on my Pilates XP2 tub.