Anti Thief devices.... what works

plum one of these Speedway Polished Adjustable Brake Proportioning Valve in each of ya brake lines where cant be seen, apply brake peddle pressure,..turn flow off and brakes will hold locked and make it dang hard to tow or load!! could wire up electric line lock TCI Automotive 861200 Electric Brake Shut-Off Valve on each wheel be easyer to apply when ya park...