Inability to park in underground parking lots. Or really most parking structures. I have seen lots of parking expressly forbid LPG due to it being heavier than air and a risk if it pools.

https://en.wikipedia.org/wiki/Moose_cavalry

As a person with an irritable bladder. 90%+ of the time a public washroom or easily accessible washroom would be preferred and would stop me from peeing on random shit.