That suspension should be able to handle the weight just fine. I have had 3 times that in the back of the wagon, and a mile or two down the road it levels out pretty good.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K