A vehicle is much harder to destroy than a creature of flesh and blood. Most fighting vehicles are heavily constructed from steel and tough alloys and their hulls are protected by thick armour plates, sloped or angled to deflect shots. Any hits that do penetrate may only cause slight damage or strike non-essential systems. In the case of lighter vehicles shots may simply pass straight through and out the other side without causing any damage at all! On the other hand vehicles carry a supply of fuel and ammunition that will blow them apart if they are hit, and however tough the vehicle is, its crew can be always be stunned or disabled by hits made against its armoured hide.
Shooting At Vehicles
Source: Core Rulebook 3E, p. 85
Vehicles are tougher than living troops to destroy outright, but their crew can still be stunned or disabled and their fuel and ammunition can detonate.