Since you're a dieseler, you might consider carrying a can of ether. It is very dangerous to use in an MB diesel since it can cause serious damage, but if you're in the middle of nowhere with one short crank left in the battery, a short burst of ether might get you home.

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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