How much plowing are you talking about?
Jeeps make pretty nice plow vehicle and many guys use them all night. If that's the case, an automatic is your only choice.
If you're thinking about plowing your own drive, dad & moms, your brothers and your buddies parts store, a manual might be okay.
True, Jeeps are 70% sticks, but that means 15,000 per YEAR are automatics, surely enough to find yourself one.