HI: That idea of defueling with plane upsidedown is ok. You then would only need 2 lines. Most planes you have to turn over to get the wing off any -way. It would work with them. Just take plug from tee line to let air in as you draw fuel out of vent line. Anyway you should have a craddle to place planes on to check things underneath that otherwise may be overlooked. Thanks Captin John