There was a thread on Wake World regarding this not too long ago and some guy had done an electric over hydraulic conversion. Basically at the axles everything stayed the same and there was a control unit mounted on the tongue of the trailer that would actuate the trailers master cylinders when the truck brakes were applied. I think he also has to get the tongue welded up so it wouldn’t move in and out any more. Let me see if I can find the link.
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2008 Moomba Mobius LSV. Full Exile System. Can you hear me now?