One more quick thought about the parasitic losses"
Thor may have to have those propane monitors wired to be on all of the time...
Just because your rig is shut down, and you're not using it: propane leaks could still happen...
(Unless you manually shut the valves...)
Imagine opening up a propane-filled rig, and inadvertently setting it off!
We're actually just finding ways to sneak around required setups, that are designed to keep us on the green side of the turf.
... Just sayin'...