The Ready Brake has to be matched to the tow bar type. A ball hitch type won't work with a receiver hitch type. The RB is designed NOT to come on deceleration, but only when brakes in RV are applied. There is a 250 lb. spring and shock that has to be compressed before cable is pulled. Putting a toad brake light monitor might be the best way to know when it applies.
No tow bar hook up is supposed to be backed up, your toad's wheels will almost immediately turn and skid. In addition, tow bars are only designed to pull, not push. The RB will probably not apply on a gentle reverse on level ground, but I wouldn't try to push the toad up an incline. As far as I know they do not have a lockout pin like a boat trailer's surge brake system.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI