Nathan, back in February I entered a post similar to yours, asking for opinions/info on the Mountaineer. Nobody answered me back either. I think these things are pretty scarce, I've never actually seen one other than online or in the Northern catalog.
I ended up buying a Snapper Grounds Cruiser. The best price on the Mountaineer I found was $5,000 + shipping. After rebate, the Snapper was $5,000 + tax. I bought the bed lift a month later, on sale, for $275. Ultimately, I think I got a better deal. I may have paid around a hundred bucks more overall, but I have a local dealer who will service the whole thing, not just the engine. I'm sure you could find a local service center to work on the Tecumseh in the Mountaineer, but I don't know about the rest of it. Also, the Snapper is built like a tank, all metal body work, the Mountaineer appears, from the photos, to be a bit more crude. The Snapper also has a wide variety of accessories available for it, I can't find anything available for the Mountaineer.
I'd visit some dealers of some of the lesser known brands of UV's if I were you, like Toro, Snapper, Land Pride, EZ-Go, and others. I think you'll find you can get as good or better of a deal on a UV from a hungry dealer, and get a nicer UV to boot.
Just my .02
