here is a diagram for ramps that should work on C5's that have been lowered 1.5" or less. I say should because I calculated these measurements. I would sure appreciate it if someone who builds these "lowered" ramps would get back to me with the results. The overall lift heigth is 8".

 

use 2x8's instead of 2x10's. The internal width (between the two sides) is still 9.25"

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