Do you have a functioning foot pedal parking brake? If so you can disconnect cable from hydraulic actuator and use only the foot pedal. Cable from the foot pedal and cable from hydraulic actuator come together under coach in area of drivers seat. Single cable comes out and goes to brake. There is a clevis pin through the end of the cable from the hydraulic brake. Pull the pin and that will leave only the foot pedal active. Caution when removing pin, cable from hydraulic side is under spring tension.
I did this on our previous MH and disconnected wiring to the hydraulic pump. Here is a link to all the info you need on the autopark system.