Well, for those of you on the wrong continent to hide in Cheyenne Mountain (Former nerve center of Strategic Air Command, now a decommissioned hole in the ground under a few million tons of rock) the Soviets had one of their own in the Urals...

Long term radiation hazard being trumped by short term brain eating danger, Pripyat or some of the other abandoned towns in the Zone of Alienation might work. Rivers, forests, less than 600 people in a 30km area, now bountiful wildlife... Its pretty nice if you ignore the long lived nucleotides. The power plant still works to some extent - Reactor 3 continued to see use until January 2000 - so if you have a bit of knowledge about RBMK (Light water channel steaming reactor) design, you could have 1000 megawatts of power too.

Long term mobile habitation seems to be a losing proposition. Far too likely that a few mechanical failures leads to stragglers or stranded people - and fuel/spares would rapidly become a problem. For a small group perhaps, but we're thinking big at the moment.

A boyscout camp like Philmont or Ma-Ka-Ja-Wan (where my siblings are staff). They're in the middle of nowhere, yet have running water, and facilities for a few hundred. (One of my brothers cooks for 600 people three times a day for six weeks...) Not that .22 is the most effective round, but the camp does have two shooting ranges with over a dozen rifles and hundreds of rounds of ammo apiece. (There are also 12 & 20 gauge shotguns and some black powder rifles. Furthermore, its Wisconsin are- other others too be found... The range instructors sometimes keep their own personal weapons there as well.)
There is a fine line between hobby and obsession. I seem to have lost sight of it some time ago.