Going to work this morning, I was pulling a single axle trailer to drop off at lunch at a buddies house. Cruising along at 30-35 MPH. suddenly the truck lurches and I'm pointed at the median. I correct, but the trailer over corrects for me. the truck and I are flung between both curbs (boulevard). I know I was on two wheels at one point, i think the trailer pulled me back down. For several hundred feet I was swerving from curb to curb. Finally get the thing stopped on the shoulder. And I just sit for several minutes, collecting my self. Then walk out on the road and pick up the ramps. It wasn't until I got to work that I noticed the A frame on the tongue of the trailer was bent to hell, then I noticed the holes in each quarter panel. You know this trailer was really swinging.