It looks like a tow pilot can fly under a private pilots license. There are several stipulations, including needing to have 100 hours PIC in the same category aircraft, etc, etc.

Does anyone know about the medical requirements? I currently am using BasicMED, and have no current plans to get any other type of medical. The only reason I would potentially consider getting my commercial license would be to then get a CFI. You could theoretically earn the commercial license with just the BasicMED and not use the license for hire. Then you could earn the CFI and use the BasicMed to then act as a trainer.

I think my flying club requires a commercial license. But that is most likely to satisfy an insurance need, not an FAA need. Again, if you're not flying for compensation, you shouldnt need a second class medical. So I'm wondering about actually providing a tow to a fellow glider pilot.