If you have hydronic heating such as the Rixen's Espar-based system, the best thing you can do is to extend the glycol lines to protect the tanks and under-vehicle plumbing. This trick was introduced by ARV a number of years ago. It is great. If you also enclose the area in sheets of extruded insulation, it will also warm the floor and contribute significantly to comfort.
Not a trivial project, but not rocket-science either.
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Now: 2022 Fully-custom buildout (Ford Transit EcoBoost AWD)
Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)
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