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Nothing is more guaranteed to cause both ones' jugular veins to explode violently from end to end, than to come up behind one of these monstrous wobbling behemoths,
Can we take it you're not a fan of caravans then Alan? [Linked Image] It doesn't bother me to come upon them on the road, but then I've been the one towing the things sometimes.

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Gas heating in a caravan?
Yep, it's been common for decades. So long as the proper ventilation is maintained, there's no problem.

Many later models (mostly tourers rather than statics) have blown air heating with burner unit which is sealed and exhausts to the outside.

As Sven says, LPG fridges are also pretty common. The small versions for touring trailers are often 3-way types: 240V AC for on-site where a hookup is available, LPG for on-site with no mains hookup, and 12V DC for when actually on the move.