If you are concerned about hills and stability, then be sure to step back a little and take a look at the footprint of the tractor (with dealer with you). He should talk with you about the wheel rim options and ballast options. We have hills. I was concerned about that. I selected a wide footprint. That and ballast may help a lot. Also. unless you are only needed to mow acreage, I would be careful buying a tractor HP based on having only 2 acres. especially doing rock - loader - road maintaining work. Best wishes, Larry