If you don't have a large tractor already (or need it for other work), you'll probably find a used heavy truck a much better idea. Would be more expensive (but still a lot less than a serious tractor or serious tractor upgrade) if you need to go on public roads, if you don't a real beater of an old dualie that doesn't need to be licensed is probably a good bet. Can go much faster than with a tractor. For a tractor you may find a somewhat smaller tractor with a blower is a more cost-effective solution - slower but no banks. Tractor plowing is going to be slower but banks less of an issue as a loader mounted plow (or offset rear blade) can often move the banks which isn't possible with a truck plow.
You'll get better answers if you describe exactly what you are trying to do and what relevant equipment you currently own. eg. "1 mile private drive, gravel, open countryside, some drifting, minimal hills, large garage/barn on property, live there" is a lot different than "hunt camp, 1/2 mile logging road up steep twisty hills, no storage or power on site, need to drive there from xx". Answers will also depend on what other uses you have for the equipment: a farmer's solution will be different than a contractor's for example.
