The July issue of SSA Soaring magazine has a cover photo that shows at least 3 unattended gliders with the tail dolly left on. In Arizona you'd get an earfull for doing this as it puts any other glider within half a wing span at risk.

Maybe it doesn't matter at soaring sites where there are no thermals or wind gusts? Maybe it's only an issue if a wing wheel is being used?

Andy GY