Ah, I see. Makes sense
I was thinking we could do this either in Free Roam or in a Point-to-Point race with traffic on. We all start at the port in Los Santos (Where you deliver the Simeon Vehicles), and race all the way out to the dock where the nuclear waste collection submarine spawns. In the point-to-point, we'd have to do a GTA race so we can get out of our vehicles, and all start on foot like that.
The starting cars could be compacts maybe so respawning in a car wouldn't be a big advantage.