I drive a Kubota B3300SU tractor/loader package. I believe the B3200 is basically the B3300SU with smaller wheels. You can likely get a better price on a B3300SU package, rather than starting with a B3200 and adding everything in the B3300SU package as options, then adding a Backhoe.
B3300SU tractor/loader new $20,000 without a Backhoe.
You probably can add a Ball Hitch to rear of Backhoe to pull a trailer but both tractor and wagon would be roll prone on uneven slopes.
Sounds like this would meet his needs as a SECOND tractor.
B3200/B3300 size Kubota can pull 60" implements.
You need a larger tractor capable of pulling 84" - 96" implements to crop 100 acres.
Sitting on a SMALL tractor trying to complete BIG jobs gets old after three days.
Also, a larger tractor is smoother riding.
Is the Backhoe essential to your father's needs?
In lieu of the Backhoe consider a Utility Vehicle, new about $10,000, for hauling tools and a dumping trailer as the backup for wood hauling and road maintenance.