A little more down to earth in terms of scale of things for airsoft.. I can't help but think that this little buggy sold out of Princess Auto would be the absolute cat's arse for recon or resupply scenarios, with perhaps an AEG mounted on a gimble off of the front end or roll bar, in an approximation of the SF dune buggys used in both Desert Storm, and in Afghanistan at the beginning of the war... or perhaps i'm just a big kid at heart who's never gonna grow up.
150cc, 9.9 rwhp, common Honda GY6A based scooter motor with a reverse gear, load rating at about 400 lbs, and good for about 39 mph maxxed out. There is a governer kit available for it that would limit the top-end to about 20 mph. A quick redo of the red bodywork with Krylon paint and a set of seat-covers to fix that high observability issue, and addition of some larger running lights for safety, and it is definitely an alternative to a Gator, at significantly less cost.
http://www.princessauto.com/pal/prod...-150cc-Go-Kart