Parking Brake Actuator problems of the 1996 Chevrolet P30

I have a 1997 rexhall motorhome on a 1996 p-30 Chevrolet chassis. The auto park brake, at times, comes on when in reverse or drive stopping the vehicle very abruptly. I am very concerned that this is going to happen at highway speeds and someone in the motorhome or following to close will be injured and/or killed!! I have tried to have this situation taken care of but the dealers I have spoken with don't seem to have the knowledge or information they needed to remedy the problem. I have seen this situation mentioned on RV forums and it appears there are many p-30 chassis with this same problem and cannot get it resolved. I pray that you get enough complaints on this problem to investigate it before things get serious which might result to injury or death. I am at the point that I hesitate to drive this vehicle in this condition. Thanks for listening.