I'd imagine inflation would screw you with an Antonio Carraro no matter what.
I don't know if this is relevant for your usage but given that you've looked at the Carraros I'm assuming you have some work to do on hills. I've found that the 5325 with the 24by24 transmission is great on hills for mowing so long as you go slowly, have wide wheel spacing, and pay very close attention to obstacles etc.
If you are really willing to wait for a good hill tractor, I know that John Deere just introduced the 20A and I'm hoping that they expand their offerings to include the larger Goldoni products (
http://www.goldoni.com/eng/trattori.htm). These tractors, if equipped with the dual wheels on each axel are incredibly stable on hills and the larger ones have the reversible stations which would be great for mowing.