I know its common practice to not Brake test some 4x4s on the rollers, they use a throw meter instead, but never had a prob with LSD cars - you just tell the machine is got an LSD and it does 1 wheel at a time!

-60mm Drop i reckon would catch, my Orion is -40mm which is -30mm for a turbo and that catches the mudflaps when in the rollers and on the beam jack on the mot ramp! Still you can't have standard ride height can you!?