If you saw how very tiny the inner diameter of the fuel line is you might not be so nervous. I run the B4 and it works great, lot's of heat. I'd be way more nervous with propane on board and a pressurized tank.
My ambo has 2" of solid foam insulation all around and 1"sub-floor. I might shoot insulation foam under the van as I've seen on some buses but it messy!
I'm almost done installing my Webasto Airtop 2000 and although I hope it will sufficient I already got my ambo set up for an Espar Hydronic ( to help with cold engine and extra heat/hot water will be nice).
But if I had the space I would have used a small wood stove. My friend has the one linked earlier. They are made in Québec and are extremely well built. It takes hardly no wood and burns hot! Plus it's much cozier than the ticking of a fuel pump...
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I have owned an espar in a diesel and a gas... the diesel version is more sensitive, than your Diesel engine, to fuel geling... and even with seasonal fuel and anti gel formula, I have had the espar shut down on me due to extreme cold temps...
Theoretically, this should not be a problem in the gasoline version... in my current gasoline espar, I have not been in the same extreme temps I have with my diesel, yet...