Dang, that sounds like an adventure of the no fun kind, but it sounds like you have a solution.
Have fun with that Bobcat.
no solution yet
That happened to me here in Susanville a few years ago-but got lucky and found a smart clerk! The latest thing is how old your tank is-seems like there is a memo out a while back saying ya can't fill 'em past a certain age, but if you find someone who has been doing it for a while no problems-just the new ones being to safe!
brand new tank
In the past I used U-Haul on Williams st and Saliman to purge my new tanks.
they said no
the local home delivery propane companies said no
someone called me back from Tractor Supply and their description of how they purge a tank does not match DOT instructions (and some odd thing about how they are "not allowed" to call it "purging")
I am beyond worrying and well into a state of freaking out.