Interesting. Anything linkable? I poked around their site and only saw this:
The Recreation Vehicle Industry Association: Standards
Quote:
Propane line routing and accessibility - all joints in propane lines must be accessible for periodic leak testing and repair. Lines may not be installed in spaces where a nail or screw could pierce the line.
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Looks like summary material to me.
In my state (not that state codes matter here, but at least I know them...) the rule is about fittings - gas line run through walls has to be protected with nail stop plates, and you can't have inaccessible fittings. It has to be a continuous run in any cavity. That makes sense to me. Not running it in a wall at all doesn't - going THROUGH the wall is IN the wall, even if only for a few inches. My current camper has black flex line running through the frame and then up into the kitchen and to an outside port. All of that is run through a space that's skinned on both sides - definitely "wall-like".
Talking about what you want and don't want - you DON'T want a gas leak. If you HAVE one, you don't want to not KNOW about it. You definitely don't want it to "pool" or "collect" where it can't dissipate, and since propane is heavier than air, that means bottom venting.