Yes, and it was one of the most frightening experiences of my life. Several years ago my country band played a local July 4th parade. We loaded everyone and a PA on to a flat-bed trailer. Just loading it scared me. The trailer bed was convex to begin with (I guess to compensate for heavy loads) and I felt like everyone was going to roll off one end or another. We had to duct tape the heck out of the PA tops to keep them in place. I ended up sitting on the top of my amp. This was all powered by a generator that was put on a lift-gate on the back end of the trailer. Just as we were pulling away from the sponsoring restaurant, the generator died. It took another ten minutes to get it started again. That made us late for the parade line-up. The driver figure the best way to make the start time was to, and I kid you not, take the freeway south for two exits. I was nearly soiling myself sitting on top of my amp (just a Walkabout 15 combo) clutching my bass in one hand, my hat in the other, and my feet anchoring a PA top that didn't stick too well despite the copiuos amounts of duct tape as the truck and trailer began to move down the street. Then, the truck turns and proceeds over the freeway on an overpass. I already feel like I am way too far off the ground for safety. Then I look over the side and see we just added another fifteen feet between me and a very busy roadway. And, yes, I am afraid of heights. Then the driver enters highway 680. I was freaking out! Now we are going over 50 miles per hour for about a mile. The last thing I remember saying to myself before my brain went into circuit overload was, "Boy, I hope there are no police around to see this!" Just as I finished thinking it, a CHP motorcycle officer rolls up next to us and gives us one of those "now I've seen everything" looks. He "escorted" us to the offramp. The parade itself, which we barely made, turned out to be very long and slow. We ended up playing the four songs we had planned at least three times before it ended. That was the last time I have played on a "float."