OK Garpoonga here's a little more on the field expedient quick mount/dismounting 3PH carry-all. The over all length 28" and it's as wide as the 3PH towing cross bar.
With the 3PH level and the carry-all pulled out below you see the tapered end of the plywood that slides into those 2 vertical slots. Cut the slots 5" deep or to fit.
the next pic shows what the carrier looks like pulled out with the 3PH level for show and tell purposes.
The only important detail with this 30 min project is
make sure the 3PH is all the way up when you make marks for mounting the 2x4 or 2x6 that's closest to the seat. Because this carrier is all the way up 90% of the time.
Underneath the carry-all I have a 6' logging chain wrapped around the ears of the 3PH...it's easy to lift the back end of the carry to get to it...and like I said this is less than a 30 second off/on.
In the summer sometimes I'll put one of those plastic milk crates in the carry all...
...other times during the summer I can carry many long and short handled tools standing up in that box. To do that I lash a couple of furring strips across the back of the ROPS and with the aid of a couple of bungee cords they stay put...
...crude but effective.
I use to carry things in the bucket but the as the knees gave out I got desperate and cobbled this us...saves me many a mount/dismount.
This Kubota has a woods 72" rear cutting deck that's so sweet I have no problem putting it on one day and taking it off the next. And that's exactly what I do cause I never take the cutting deck into the woods.
We cut a little less than 5 acres but I mostly never cut it all at once. Like a golf course we cut every day...but I only cut for 30-35 minutes or so it doesn't become a drudge type of chore. When the deck comes off the carry all goes on.
Sorry for the long winded post.