Okay, first lawn of the day. Driveway is straight with loop at the top. The entire driveway has a slight uphill incline. I usually drive up and around the loop with truck facing downhill. I then back up as far as I can so that when I drop the ramp, truck faces down hill and I'm out of everyones way. I have a 2002 Silverado, shortbed 4 X 4, and a 14foot trailer. So, I weed whack first and come back to unload the Z steer (LazerHP) from the trailer like I've done at least 40 times from this same spot. Drop ramp. Climb on mower and let warm up a few minutes. Start to back up and off trailer when I get the wierd sensation like the trailer is moving....OH CRAP! It is moving :blob3: When the mower got past the axle of the trailer the combined weight of me, and the mower (with full tanks) lifted the rear of the truck just enough to let the truck and trailer start sliding down the hill (driveway is oil and stone with lots of stone) So what to do? I pulled the mower up but the truck kept sliding so I threw the brake on the mower and jumped off the trailer in hopes of getting into the truck before it picked up any more speed as it continued sliding down the hill. It's important to note that I am 46 and a "little" over weight. The laws of physics did extend themselves to even me when I jumped as I noted that the weight I am carrying was more than the braking action that I was trying to execute. So, looking Cartman from Southpark I did the only thing I could do as soon as I jumped off the trailer....fell and rolled looking like a fat white snowball rolling along side my sliding truck and trailer. All I could think of was "they are going to find me underneath the truck and wonder what the heck happened." When I came to a stop so had the truck. Just by me jumping off the trailer, the trucks own weight came back into play and stopped it from sliding. I got up, brushed myself off, had a good laugh, learned a lesson about weight distribution and went back to work. If someone had a video camera, it would have made a great shot.