If it's acsessable from underneath, you could possibly install the "Extend-A-Stay" and run a remote line out to a spot that is easy to hook up the remote tank.
Any propane shop should be able to tell you if it will meet code or not. That may be the fly in the ointment.
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Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back.
Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!