Suggestions on customize a carry all please.

[California]

...pull 3 tires behind the tractor bolted in the shape of a triangle to groom the road but a D right bolted somewhere to it should make for an easy attachment point.
Suggestions please.

This might give you some ideas to make a lifter for your lane grader. And maybe light-duty pallet forks.

I cobbled together this rear forks assembly for a specific task 20 years ago. It's still in use and has never bent. Aside from carrying pallets, I use it to lift a light lane-grader as well.

I estimate its weight capacity is 800 lbs. This tractor's 3-point is rated 750 lbs and I had to remove some water before I could lift these three cans, 750 lbs plus 100 lbs for the forks and platform.
But no damage to the forks bouncing over rough ground.

Next photo - lane grader under construction, also cobbled together from scrap. The cross chain is to lift it. Next construction step was short chains from each front corner, to hooks that grab each fork upright.

I lower the forks onto the grader for added weight on its front edge. I could put ballast near the middle but don't seem to need it.

If you want a permanent 3-point mount for your lane grader, it could be like this.

 

[bdhsfz6]

Instead of spending the money on a carryall, I bought this 3pt to SSQA adapter and use my forks with a pallet as a carryall. I have a deck box bolted to a pallet that I use to carry tools, chain saw, etc. It also keeps the FEL bucket free to carry the coal bags

The forks are rated at 4000#, much more than the 3pt will lift, so no worries about breaking anything.

3 Point to Universal Quick Tach Adapter | Titan Attachments

Cat 1 quick hitch adapter for attaching quick tach tractor and skid steer attachments to your tractor.

palletforks.com

I also burn coal and spread the ash with an SSQA 3pt spreader. When the road gets slick, I drop the forks and pick up the spreader:

When not on the tractor, the spreader sits by the back door and I just dump the ash pan from the stove into it.

 

[BackRoad]

Mr. BDHSFZ6, since you've had good luck with your set up, do you recall where you purchased the 3pt to SSQA, and was it a specific brand?