Rolling down a hill seems to be a common theme. The house and driveway at the time (2000) were on a hill. I was working on my 85 4runner and had the MT in neutral as I was doing something with the engine running. Sheri comes out, says we have to be somewhere and I shut the truck off and we left. Couple hours later we return and for some reason, I park the 95 4runner behind and perpendicular to the 85. We went inside and 2 mintues later, I hear the BAM! The 85 had rolled about 15 feet and slammed into the 95. If the 95 wasn't there, it would have rolled across the street and into my neighbors front door. The 85 had a Stout Equipment rear bumper on it but only damaged the passenger front door. I bought a new door from Toyota and had a body shop paint and install it. My current driveway is flat and the parking brakes all work.