All of these ideas are brilliant, as usual. However, we are going to take a slightly different approach. This thread reminded me of one Wayne (RVHarvey) had previously posted about installing a deckplate in his holding tank for cleaning purposes and I thought "Hey, that would work for refilling too!" Anyway, we've ordered one and the plan is to toss the cushions out of the way, open the deck plate, and use the handy support provided by the holding tank. I don't know if this would work for every model or everyone's individual needs but for us, what's not to love about this?
Malinda