Also . . . you may want to look on eBay for a used APU from a truck. New, they are $10K, but when the truckers try to upgrade their trucks, and find they're not going to get anything from the dealership for their APU, they sell them on Ebay. Most of them now are outfitted with 110V power.

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002