I had the same problem---no place to haul saw, wedges, fuel, etc... I use a small trailer, and it's hard to keep everything from falling off of a full load!! Solution: A very light weight carry box that goes on 3 pt. I used galv. pipe and 1/8 x 1 1/2 x 1 1/2 angle to make a frame to hook up to 3 pt. After that, I welded two pcs. on that looked like forks sticking out back (about 16"). To these, I bolted a 3/8" pc. of plywood. Now we have a small platform att'd to the 3 pt. The secret: Go to Walmart and buy a plastic storage container and screw it to the plywood. Get it deep enough and you won't have to worry about anything bouncing out.
Whole thing might weight 15 lbs., and will go high enough for me to still hook trailer to drawbar. This is the most used attachment that I have!!!