I had something along the lines of this happen to me once with the 5 ton cube truck we had for a wash truck with our polish shop I polished the rims and forgot to throw the airbrake back on before dropping it on the ground as soon as I dropped the front end she started rolling in towards the shop it was only a car length away defs a scary feeling luckily I had planned over and over in my head for this for not knowing if a coemployee threw the brakes back on or not on other trucks so I was quick to react I kick myself in the ass all the time cause I have a habit of putting safety second or third, now I always check brakes before dropping a truck on the ground kinda funny the one time it happens is when its my own responsibility.....