Unfortunately, they are just toys , not models. They have no suspension and do poorly on unlevel terrain as they have NO suspension system. If you want fun and cheap try a 1/16 Heng Long tank. They will actually be cheaper in the long run (excuse the pun). They shoot airsoft BBs and are available (for extra cost..naturally) with a sound and smoke system. They allow up to 9 tanks to battle simultaneously. Caution these tanks are very, very addictive!!!
For more info in the NY area check the Quenspanzergroup at Yahoo.com. Bob.... thecommander