First vehicle idea:

Gnome jet: (very) cheap. Light armor. Canbe driven on the groun, until you are in position. You then "launch" the plane with alternate fire (or something else), and the plane will take off with enourmous speed, but only go a certain distance (either in astright line or you might be able to steer it like a gliding plane (sp?) ), before it lands and self-destructs, leaving the owner able to continue on foot. Nice for airborne infantry rushes on the enemy base

Watch out! In the sky! its a bird! its a plane! Its a roof-gnome!