Since the pro cons are 120V I am not sure if a DRB could handle the load if you swap out solenoid valves for flo jets to pro cons. This might require a relay.
Tunnels have Pre Soak, Tire cleaner, Triple foam
soap, Triple foam Polish wax,Sealer wax, Drying Agent, Tire Shine, and Rain X. So that's a dozen pumps (some might have more) and foaming soaps need a solenoid valve any way which can feed both the air supply for foaming and the flo jet so you'd need that any way plus relays and electrical for pro cons.