I was on www.JCWhitney.com today looking for a tent to park my car under at the RV site I am staying at (I am doing the traveling contractor bit right now) and I came across this:

http://www.jcwhitney.com/autoparts/ItemBrowse?storeId=10101&Pr=p_CATENTRY_ID%3A100000529627&productId=100000529627&catalogId=10112&langId=-1&rlid=home_best

It is a remote stater that will work with diesels. One of the features is that you can set it up to start every two hours and run for 12 or 24 minutes, your choice.

The big question would be if the 12 or 24 minute run time would be enough to recharge the battery from the drain of the start cycle.

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.