There is more than one outfit selling Mules. They are easy to buy and you can get one in good shape for around $2,000.
I am almost certain that a Mule cannot be licensed as a motor vehicle. Quite a few states require ATV's to carry insurance and in limited areas they can be operated on roads for limited areas. A Mule would be considered an ATV.
My son has a garage full of quads, trikes and motorbikes. In PA, where he does most of his riding he carries insurance, riding in NJ, he doesn't and in NYC he can't ride the things legally at all. Go figure.
BTW, there are a couple of really nice Mules on the East Coast shows with 106mm Recoiless Rifles (not live, of course). A TOW is a little harder to get....not impossible, just hard to get.
TTT
Sometimes I am the windshield, sometimes, I am the bug.