This is what mine looked like when new:
U-Dump Standard . Attached is a pic of the actual one I got. They are around $5K to $6K new. I paid $1,800 on EBay. It was located in Clewiston, FL, about 2-1/2 hours from my place -- I got lucky. It had a little rust in the floor. I'll weld in a new steel floor after my barn is built and I have a place to work, but for now, I bolted some plywood in the floor to cover the rust holes, and it works fine. It's 6' x 12' x ~30" high bed, is rated at 12K lbs., and holds about 5 cu. yds. -- more if it's heaped up. When I start hauling shell rock to surface my 800' driveway, I'll only haul about 4 cu. yds at a time, because the shell rock weighs over 2,500 lbs. per cu yd. I'll have to make about 80 trips to the rock pit where they excavate the shell rock (similar to a crushed limestone with sea shells in it -- excavated from about 60' down -- used to be ocean floor under us), but the pit is only about 3 miles from my property.
The shell rock goes for $1.50/cu. yd. at the pit, or about $30 for 20 yards, which is a normal large dump truck full. I need about 320 yards, which will cost me about $480 plus the cost of driving 480 miles -- 80, 6 mile round trips. Call it $1000 total in round numbers. That same amount would be 16 - 20cy truck loads at $200/truck, delivered, or $3,200. The difference, $2,200, pays for the dump trailer and the new steel bottom. I also figure I've saved about $1,000 in dumpster fees, so far. By the time I'm done, not only will the trailer be free, it will be filling itself up with $$$ I've saved. When it runs over with $$$ I'll by a new one... /forums/images/graemlins/grin.gif