I just installed a tow=pac trike kit on my wife's 09 GV-it seemed to be the only way to get her to ride. Though I had not thought about it, I realized there is no parking brake on the GV(as I was chasing after it down the slight incline) Is there any sort of aftermarket unit, or any other ideas as to how to keep it from rolling (other than the strap around the brake lever trick)?