I have a 2008 Roadsmith Trike. The reverse went in mine too. I can hear the electric motor spin, but the gear does nothing. Mine is a Verticle mounted motor, and then it goes into a 90 degree gear box. Begining of April I contacted Roadsmith and they thing the gears inside the gear box "exploded" was their term. So I asked about a new gearbox and they said you have to buy a new motor and modify it to their new Horizontal style. Said it would be around $850. Screw that, for another $200 or so I will go with a MMD mechanical reverse for $1099. Of course mine has the 6 speed transmission, not the 5 that makes it a little more expensive. But this seems like a pretty rugged set up, not quite as rugged as the Baker reverse, but still much better in my mind than a electric motor. Best of all the install videos look pretty straight forward.
WWW.erouwingusa.com or they are on Ebay as well. Now I just have to remove all the stock reverse stuff, but I think I can do that over the winter.