When you write "close to 1,000 pounds," I assume you mean UNDER 1,000 pounds.
A Kubota 723 FEL should lift APPROXIMATELY 723 kilograms = 723 X 2.20462 = 1,590 pounds gross from the ground.
Lift capacity decreases rapidly with height, so you will not be far from max lift at tailgate height.
Do NOT lift via clamp-on bucket forks, which will position the load farther out, PROBABLY OVER MAX.
SSQA attached forks OK.
1. Mount at least 800 pounds ballast on tractor Three Point Hitch.
2. Position tractor and truck on solid, smooth, level ground. Set tractor parking brake.
3. Secure the tiller in the bucket with straps, rope or chains so tiller cannot shift.
4. Fasten seat belt. Lift bucket two inches. Stop.
5. Have assistant cautiously drive truck out from under tractor load.
6. Gingerly, lower bucket to the ground. Do not move the tractor even one inch while tiller is in the bucket.