have you thought about lpg instead ?
it's apparently really easy to convert stuff over to lpg, and then you can burry the tank wherever you like and fill up at the motorway services etc...
it's a bit more expensive than gas, but makes things easier if you don't need to get a bottle in/out, and it's not like you'll use a lot ?
(that's what I'm planning for mine)
also thinking about making myself a 'storage radiator' - just a tank of water to be heated via a FPHE when the engine is running... 100litres or so, I'll have it boxed in or covered up or something like that during the day, then on a night uncover it and it should give out some nice steady heat
can't remember his user name, but there's a guy on VOD who had an oil tank in the front of his sprinter between the seats... the surfer who goes all over the place, (maybe ski too?) to the alps etc... anyway... he said with his tank of hot oil in the van there was never any ice on his van in the morning when everyone else's was iced up and covered in snow... guess it's worth a shot! (no noise too, I HATE any noise when I'm trying to get to sleep)
