Building a Dump Trailer

Anyone ever build a dump trailer? What did you have in it $? How did the project go and how'd it turn out?

Are you talking one to be pulled with an ATV? I built one about 10 years ago when I built my hunting shack. I originally had a wood box on it and didn't like that so I modified it using 1 and 2/3 plastic 55 gal drums with an end gate made from aluminum and the hoist is an ATV winch. I have hauled over the years, close to 200 yards of gravel with it. The box detaches with one 3/4 inch all thread which is the hinge pin on the back and then unhook the winch hook. I've hauled 1200 pounds of bagged cement in one load many times. That's about the limit I want to load now. The tongue detaches and I can add a 10 foot extension which is how we hauled trusses 1 mile. The coupler end of the tongue is pipe in a pipe so if it does tip over it will just swivel and not tip the ATV. I did it once and just reloaded material and away we went. the design is a walking beam axle. The load centers over the main axle and hardly no extra weight on the ATV. Original cost was around $600.00 for material. I did my own fabrication and design. I've replaced more than one set of tires and on my second cheap harbor freight winch. It sits outside at my shack and the weather beats it bad. I don't have time right now to remember how to load pictures, but if you are interested I will try and figure it out.
Gary