Totally aside from what I'd do (but I think I'd be OK in this particular instance - less than 15 minute ride, everyone masked, and open windows are all the mitigation measures we can take right now), I would check to see if your GS council's Covid policies for in-person troop meetings would prohibit this kind of carpooling.
My council doesn't explicitly prohibit this (see their guidance for volunteers document), but it does strongly recommend that carpooling and public transit is avoided for troop activities, meetings, and trips/outings at the present time.
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Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle