Testing for practicality. Both the trailer and the excavator are 4' wide so can get into smaller places like trails, backyards, etc. Hauls about 2/3 cu yd per trip. Turns and backs up a lot easier than pulling with ATV. Pulls a larger load too. Travels a lot slower though.

UPDATE - I have modified this video at 3:59 to show a photo of a hook I built for the thumb which improves the dumping process. In addition to easier hook/unhook it gives another couple of inches height when lifting the trailer off the ground.
The hook slips over the thumb and quickly attaches with 1 bolt.