What do they use? I bought a 45 horse Kioti with backhoe when we moved to New Hampshire, and the owner said they filled the tires with something, but I don't remember what it was. That was a great tractor, I like the loader control stick way better than Kubota's. It's based on the Case format, I think. Kubota's is loose and floppy by comparison.
Hated to sell it, but it was time to move south, and we lived in an apartment for a year when we arrived in Virginia. I'm glad we did, too, because we found the perfect place. All in God's time, I suppose.