-Here's another question about low tow:

-Has a glider on low tow ever pulled the tail of the towplane DOWN and caused the towplane wing to stall?

A: No idea. Never heard of it happening, But, I would think you would need a proportionate amount of altitude to cause that, and a stall recovery is easier at low altitude when already at full power, especially if you dump the glider, than an extreme nose down at a far lower altitude on take off. Imagine the angles. Would you rather be nose up or nose down at 200 feet?