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For the team endurance race I was thinking something along the lines of EX takes the starts, runs 20 (or however many) laps. At the end of their 20 they pit in and the AMs come out. When AMs run their 20, the NV get out..this way the worst that is on the track together is EX and AM, or AM and NV. I thought that should buffer the speed differential a bit.
We could have individual entries and have a random drawing for teams (if you want this to just be good fun for a good cause) or people could stack their teams themselves.
I have no idea how much interest there would be into such a thing however...