It is true that you need escape for air behind the bladder. That said, i really can't think of any good reason why a bladder shock wouldn't work for 10th off rd. Touring car shocks all use bladders, and seemingly 1/8 may do as well.
You can build a bladder shock with no re-bound if you want to - it's easy!! In fact i find bladder shocks easier to "tune" for rebound, so i can't see any reason not to use them!!
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