I work for a local DPW here that mows and maintains all the schools. I love it, it is the best job IMO, but there are always those days that give you a headache. I was hauling a fully loaded 14' dump trailer full of loam with a F350 dump. My boss had hooked it up, so I figured everythign was set. I checked the safety chains really quick and hoped in the truck. I was driving down the road at about 35 MPH and something just didn't feel right. I slowed down and turned right into a parking lot, but the trailer kept goinjg straight... until the safety chains caught up with it. I didn't panic and slowly came to a stop ion the parking lot because I didn't want to jam on the brakes and scratch the new truck and trailer. I hooked the trailer back up after a little injunity and limped back to the shop. What it cames down to was my boss had put a 2 and 5/16ths ball on a 2" ball hitch on the truck. First time I had ever had a trailer come loose on me. I was lucky that I wasn't going any faster. EVERYBODY check your rigs over no matter what before you start out. You never know what could happen.