I’ve always wanted to see dune buggies in game, 90% for cool appeal, 10% for the practicality of having a fast scout vehicle.
You could have two varieties, a bulkier, civilian racing model (possibly based around the game’s existing Beetle/Car, as a lot of them are in real life), and a militarised version similar to those ridiculously Mad Max looking things the Navy Seals use (http://en.wikipedia.org/wiki/Desert_Patrol_Vehicle). Upsides are high speeds, a narrow frame that can squeeze between wreckage easier than a car or truck and a comparatively low fuel consumption (they are feather light, after all), downsides are low storage and little to no armour.
Just a thought, anyway, happy to hear ideas/feedback.