A word of warning to everyone - gas tanks explode. I started driving northward, and when I turned it swung the ass-end of my WARBUS out and it struck a wall, causing a series of explosions on the gas tanks and setting fire to the building it hit. Luckily, I was far enough in front that it didn't hit me.
I'd managed to get some Hard Plating on the front and shift the old steel plating to become roof tiles.
I'm realizing more and more that the WARBUS is not designed to interact with towns and buildings. There are several issues that make it simply impractical to drive into somewhere.
1: Zombies will bash the walls down, no matter how much you armor it, a zombie on the other side will relentlessly chip away at the HP pool - I personally think a regular green should be unable to inflict damage on an armored tile.
2: Vehicle in the way cannot be destroyed. You can destroy the parts, but still collide with them, and it's difficult if not impossible to knock them to the side.
3: With the way vehicles "break" when they turn, you can easily smash something with your rear end when using a long vehicle. This can result in awkward and sometimes lethal crashes.
On the other hand, the explosive quality of gas tanks provides unique options.
1: If there's no dynamite or grenades, would should be able to build a vehicle directly beside a military bunker consisting of only a gas tank, then destroy it and cause an explosion.
2: With a small engine (lawnmower?) and a compact frame, you could have an 'explosive bicycle' that you could turn on cruise control, aim into a horde, and jump off. If you can shoot it, then it should make a huge explosion.
3: Anything that would damage a vehicle should work, including the 'spinning blade trap' which could add some explosives to your trap.
4: At sufficient speed and design, cruise missiles!
EDIT: Shamelessly savescumming this.