Just an opinion. Webastos are $$$$$$$$$. It might be better to buy a 1k or 2k Honda gas generator into which to plug the electric block heater on cold days. You get the benefit of a warm engine for roughly the same price, plus you have a generator for other uses. You could even buy a Harbor Freight generator adequate for the job for about $200.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13