Check out the track bar in the front, the bushings maybe bad and can cause the front axle to wander making you have to correct the steering most of the time, not good for alignment and tires.
To add to that, the tie rod ends on the steering arms, check those out see if they need replacing.
Oh and what kinda Mercedes do you have? We have a 420 SEL, also an 86'. 
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Pat Albaugh, Midwest Moderator
"Diffage" -the point at which the truck's differential makes contact with the ground.
http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006)
1995 RRC LWB
-LT265/75R16 Pathfinder All Terrains
-RTE 2" Lift Springs
-Pro Comp ES9000 Shocks (from DAP Enterprises)
-KMC Front Diff Guard
-4 Desert Fox 55 watt Lighting
-Radio Shack CB Radio (never know when signal fails on a cell phone)
-2 Halogen Super Sport 100 watt forward lights
-Custom slim style front bumper w/ integrated bull bar
-Lowe's Special "Homemade" Snorkel
-T-Case out of an 92' RRC
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