Something I ran across at the bike show last weekend, a Ural Patrol:
Not just a sidecar, a two-rear-wheel-drive bike; there's a driveshaft that delivers power to the sidecar wheel. The one I saw was a 2003, here's some specs on a later model.
I'll throw in that the one on sale had been fixed up in more military trim: slotted headlight cover, a RPK(semi) on a pivot mount on the sidecar, etc. Be an interesting thing to drive around, and with the off-road tires would probably do quite well in bad terrain.