I do.
I can get one.
My neighbor welded a slightly/ 10-15⁰ off-plumb, 10" square tube on the center beam of my chipper tongue. I slide the AT cart over the post after removing the AT tongue.
This angle on the welded tube gives me a little more room for my chipper's tongue jack handle movement. If I take off an AT wheel, the tongue jack handle is much more accessible. The V of the trolley matches the direction of the V of the chipper tongue.
I slot the AT tongue through the little triangle of the AT cart.
I ratchet-strap the AT cart to the chipper tongue triangle. Separately, I ratchet strap the AT tongue to the AT or tongue.
I carry (2) 4x4' sheets of plywood between the AT and engine housing. (2) 6x6" wood blocks ride in the basket of the tongue. These are for either blocking up the chipper tongue jack for a low feed-tray height, or used with a handful of screws and plywood to make a 90⁰ chip catcher corner for leaving chips onsite, neatly.