seriously, it is unsafe to tow anything with a diesel mercedes, the earlier ones because they are dangerously underpowered and the later ones because they have heating problems when towing (air flow issues)
get a truck or rent one by th eday from Home Depot

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1982 300SD (214 k, excellent shape) kidmobile running mostly biodiesel, gets 31 mpg hwy with 2.82 rear from a euro 500SEL



1976 115 body 240D 4-speed (traded for Jeep parts) - Engine lives on in my CJ7