Go to your Kubota dealer. They had or have a tire replacement policy in place for my BX25 (16 years old). All 4 tires on rims cost me $500 Canadian +taxes. You got 20 years out of the old set why source elsewhere with little to no guarantee as to quality or longevity.
If Kubota carries the tire size you are looking for call them for pricing. My Kubota (BX25 Unit) dealer replaces all 4 tires on rims for $500 plus taxes. I have replaced them twice since purchasing over 20 years ago. Check it out.
I have the same type of property and size. My Kubota BX25 with a FEL and front load 50" snowblower and rear backhoe does all the work required. 6 acres, 550' driveway, 3.5 acres grass and 2.5 acres hard bush. Hasn't failed me yet in the last 15 years
Had same problem with my Kubota. Grease the brake petal zerk to keep it lubricated and exercise the brake peddle until it frees up. It will take awhile but will eventually return to normal operation.
Buy some peppermint oil, available at any natural food store or online. 10-15 drops to a new or used 1 litre Windex type spray bottle and spray hard to reach areas and all wiring in addition to the Bounce type dryer sheets. Haven't had a mouse, squirrel or any other critter problem for over 30...