I read that you only need 2 inches for movement and growth ..on the base of that tree (mesquite tree).
There was concerns about keeping the root system and keeping a water supply to it. We have been trimming the tree upward and out.
Topping the tree to keep it's shady canopy , thinning out the shoots off the top branches so it would get top heavy in the wind.
BMWMOA 82741 ABC 8418
75 R90S , 88 R100GS ,94 R1100RS (Aragorn) 2k 1150GS DMC sidecar, R nine T