5.5ft won't let you have a 41qt rack unless they pull out sideways, but then sideways will take up 3ft of your wall. Then a 1756 would fit, so that another 18 inches, I don't know how wide your water heater is but add a table and you are pretty much out of room already. Not sure if it is worth limiting yourself that much. Even of it does fit, it's not going to be exactly nice to manage in. I understand doing what you have to but perhaps you can find another option?