Have you tried backing in? The rear on our SL's is much higher than the front.
Ken Silver
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~1993 SL500, glistening triple black, xenons:
http://www.kensilver.com/SL
~1999 SLK 230 Kompressor, silver/black leather, CD, immaculate (my wife's)
~1999 Suzuki Grand Vitara. black & silver
~1991 Daimler, shiny grey/grey leather, best in country!
~ex 350SL, 230E, 280E, MX5 and a lot of other makes not nearly as nice.