How much $ you want to spend? A loop of stout rope around the bales tied to the barn and drive forward will unload. QUOTE]
If you load the bales with the round side over the sides of the trailer, a good nylon rope attached to the rear of the trailer and run to the front under both rows of bales, then up over the top to the back again, then as shinnlinger says, attach the rope to something stout and drive out from under them. I done that lots of times to unload loose hay and also brush. I you load with the round side front to back, I think you could do the same by running the ropes between the bales back to front , then either pulling them off sideways with a car at home or possibly again attaching to a tree or ? and driving away from them. You might have to jam some sticks or something into the bales to hold the ropes about halfway up.
Smiley