>> You have to remain in your vehicle at all times (If your car flips, you may spawn a new one at the point where you car flips/glitches)
You know the ~ key un-flips vehicles right? So that would be the thing to use. Also ALT+R is a full reset of the vehicle.
The issue is the 4 hour long recording, the game/exporter not crashing and then uploading to youtube. I don't think it is do-able in that sense.
That said I think some shorter 10 minute challenges would be awesome