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I used the calculator and came up with a maximum angle of approach is 18.6° degrees on my M550i
You can use ramps RR-30 (5" lift) or RR-40 (7" lift, seems kind of aggressive).
The RR-80-10-2 is sweet, but it's 80" long. I can use this on my other car that is only 4" off the ground.
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