Well that’s interesting. Honestly, since so many trailer propane cylinders seem to be covered these days, I wouldn’t know which direction most of them face anymore. Back when they were uncovered, I don’t think I ever saw any not facing forwards.
As far as the cover being required, I thought I remembered reading that somewhere. Maybe a NFPA or NPGA publication.
If it’s common now to face the cylinders so that the regulator is close to the trailer, that might explain why there seems to be so much pushback to using the auto-switch regulators with both valves open. If you make checking the indicator difficult, it’s probably not going to be checked very often.
:):)