Now, believe it or not, but I don't normally care about cars. However, I was able to talk some people into a road-trip style campaign a la Velvet Inks and Crystal Fire's Midnight in the Dark campaign pitch.
Only one (1) problem. That campaign is very car focused. It's a road trip. And I don't really have a ruleset on hand that I really super like, so I made my own. It's definitely a little rough, but it's probably good enough .
All cars (I guess, expanding this, all vehicles) have a Size stat, ranging from 1 (like a motorcycle, I'd say) to 9 (like an RV). Size determines most important things about a vehicle, it's HD and HP, the armor it provides to its occupants and how much damage it needs to take before it rolls on the Misfunction & Destruction table.
A Vehicle at 0 HP is scrap. It cannot be repaired, though it could possibly be scavenged for parts. A vehicle's HP is determined by [Size]d10 (I made vehicle HD d10s because I wanted them to be tougher than the average meat-thing). Every Size x 1d10 Damage a vehicle takes, it must roll once on the Misfunction & Destruction table.
Vehicles also provide Armor. By this, I mean that each vehicle provides Damage Reduction equal to its size to all characters inside of it, though all damage reduced in this way is taken out of its HP.
Vehicles' movement is measured with a score I call Speed Threshold. I'm pretty sure that it means nothing, and does not describe what it names, but it was a placeholder I had that sounded cool and I haven't the heart to replace it unless I hear something that sounds better.
Speed Threshold goes from 1 (barely moving) to 6 (80+ mph). Not all Vehicles can make it up to 6, lot of them are stuck going slower. "Why only 6?" You may be asking, "Why no more?" Because my car has 5 gears, not counting reverse, but I've heard people say that normally there are 6, and I think it would be fun for the Speed Threshold to roughly equal what gear you'd be in at those speeds.
Drivers of vehicles can do one of a few separate actions on their turn while driving a vehicle, Slam, Evade, Step on it or Break:
- Slam is an attack with the vehicle, dealing [Size + Speed Threshold] d4 to the target and half that again spread throughout the vehicle and its occupants.
- Evade is used to give disadvantage to Slam attacks targeting the vehicle
- Step on It allows the driver to test to increase the vehicle's Speed Threshold by 1
- Break reduces the vehicle's Speed Threshold by 1d4.
Vehicle Destruction & Malfunction Table
Roll Severity: d10+ Damage over the Toughness Score ([Size*d10], rolled when vehicle is first generated)