I was leaning to buying the Roadmaster Invisibrake but the installation effort and permanent nature of the install made me go with RVi Brake 3, but I have Roadmaster everything else.
Is it you don't plan to use Jeep as toad at all, going with a different braking system?
I know logic says a RV Forum is good for selling RV stuff ( and it is
), but if you put on ebay it will sell faster than you think. Sometimes I watch others selling on ebay something I wish to sell, to get a good fair price to sell mine for.
I watched some buyers bid on a Used RVi Brake unit for more than another seller was selling a Used one