AFAIK scenarios are not designed to have anything to do with vehicles, unfortunately.
Therefore, I’d recommend learning how to fix up vehicles on your own, it’s not as complicated as it seems and you can always ask questions for specific advice and I’d be happy to help.
Essentially you only need a few things and most cars are mostly functional with a specific problem.
For example many cars you find will have no wheel, or no controls, or no engine, or no fuel, or no electricity.
However it’s less common that they will they have numerous of these issues (You are far, far more likely to find a car with no wheels than a car with no wheels AND no engine).
The first step to getting a working vehicle is to find 2 or 3 vehicles, picking which one you want and then dismantling parts off the others to repair it.
A particularly useful thing to note is that you can get a rubber hose from smashing up or deconstructing a refrigerator.
When you 'e’xamine a vehicle to interact with it a rubber hose lets you use the siphon option so you can drain fuel out of other vehicles into an adjacent vehicle or to any containers you have.
Many vehicles will merely be damaged and out of fuel but work relatively okay if you refuel them.
Important tools of use other than a rubber hose would be a wrench, a hacksaw, a scissor/bottle jack, and a welder/acetylene torch (and welding goggles).
You could also just use the debug menu to spawn in an RV, but that’s a horribly tempting slippery slope that may ruin your gameplay experience forever.
