Here is one I built. The front and sides come off (top board holds the sides in and then the other boards slide up and out, and there are latches for the sides) although I have not needed to take them off for the uses I have had for it so far. It has slots for chainsaws and shovels etc. on the back side. I have used it to haul firewood, take tools, generator and more to where I am working. Later I cut up an old small pickup bed liner and it fit in there perfectly. The carry-all frame was one bought at TSC.
And then when the grandkids came up, I added a bench - we call it the 'ranch uber'. They love to ride in it back in the hills.