Two man lpg

So looking to add lpg to my system, have a gas safe guy happy to install..

My question is what is the ideal set up for two men? Lpg wise.

Also I stay in a cold part of the UK, and have no power supply to the van overnight so are there any other precautions I can take to limit frost risk

Chris

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Bubble foil the inside of your van. 

Cheers green

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Watch how this guy insulated his camper. Ain't no frost getting in there.