I know some states have propane quantity limits. eg. Virginia used to have 2- 20# tank maximum (not sure what it is today): Manitoba & Nova Scotia, not too long ago, did not alloped open propane tanks while driving (that sucks): The Chesapeake Bay Bridge/Tunnel has a max. of 2-45# tanks or 2 permanently mounted tanks not to exceed 200#.
I am sure there are others that might restrict larger tanks. I would think a 100 # tank might be difficult to safely secure, even in a garage.