I was able to get some really nice results using physics simulations! Rigid body constraints set to both front and back axles on hinge mode provided the necessary pivot.
Make sure you enable linked collision to avoid crazy issues with your shocks! I made a fancy test file, complete with board riding monkey for your entertainment. Please wear a helmet when riding.
http://blend-exchange.giantcowfilms.com/embedImage.png?bid=1660