Honestly, I don't think that will work very well. I have a somewhat larger tractor (70hp Deere), but the reach of the loader onto/over a trailer (or anything else) is quite limited. I've hauled wood chips on a flatbed trailer before, and I ended up parking the tractor at the end and shoveling the chips into the bucket. Not something I would care to do on a regular basis.
What you really want is a good barge box, ideally with a metal box. If you watch local auctions and Craigslist you might get lucky and get a deal on one. They can go really high though, at least around here. A flare box might work too, depending on what you're hauling, but they are much more limited in terms of the weight that they can carry (they're designed for grain, and the back end usually only has a small hatch for unloading).
I ended up getting an old dump trailer from a friend, needed new tires and the hoist had to be rebuilt. I ended up going Amish and putting steel wheels on, because the size of the wheels was such that rubber was major $$$, and I don't need it to go far or fast. Between the wheels, new lug bots and nuts, and the cylinder and adapters for the hoses, I think it ended up being just over $1k.