Despite popular belief its needed. Atleast on my 85 it was. There is a tab on the frame that the carrier catches on when it comes down. I am happy to report Autozones compresor was up to the task for the rears.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42