The problem with keeping an oshkosh around "for when the big one hits" is that the big one only hits about once every 15-20 years where you (and I) live.
All the other times when you have no snow you'll be paying to register & insure a truck that won't get used and there's nothing worse on equipment than having it sit for long periods. That's why a year round piece of equipment is better, and it'll make you more money. Even the transfer case seals will dry out after sitting for just a few months. Then you go to start using the truck real hard in a blizzard and oil starts blowing out of the transfer case. Then you have a big impressive 4x4 that can't even get out of your driveway. They have a football field size turning radius, too...not so great in a parking lot with light poles & curbing.
We had a horrible blizzard in '97 and got 34" of snow. Back then, one of my bigger trucks was a IH-1700 4x4 dump with a heavyweight 11' plow and a Torwel V-box spreader. It was no more useful than my Ford 555 4x4 backhoe for clearing snow in the corporate center parking lots.
Since you don't have any experience driving a big 4x4 w/plow in super heavy show & ice, I can tell you'll be disappointed in your investment of an Osh Kosh 4x4 because they're useless for anything other than a once-in-20-year blizzard. Those trucks are made for where it snows hundreds of inches per year (Syracuse, Buffalo, airports, county roads, etc.)-THAT's where they can actually make you money. I'm just trying to save you some money speaking from the experience of clearing 10 acres of corporate center snow removal at a time, but do whatever you want. Even on big back country roads all the townships around here & PENNDOT abandoned those types of trucks because they just sit & rust.
We ended up using my backhoe and a medium sized John Deere front end loader to get everything open at the entrances. Then use the trucks to clean off the rest and haul out loads of snow when it gets piled too high.
When the "big one" hits, almost all retail, banking & corporate closes while the snow gets removed, it ain't like you're plowing the CIA's parking lot anyway. I'm probably older & more experienced than you and I'm just trying to give you some advice & save you some money. I've seen what works and what doesn't 100's of times.