"I have never yet seen a Pawnee being used as a glider tug that had a transponder fitted. Would'nt be a bad idea if they did have but it would have to be hard wired to the master switch!"
Good idea. In this day and age there is no reason why every aircraft that flys above 500' should not be transponder equiped.
In its simplist form - fixed to squak 1200 only, surge protected and hard wired to the master. Modern electronic wizardry - couple of hundred bucks - subsidised by our air services charges - heavily weighted so that the airlines (especially those of record profits) who stand to loose the most from a mid-air with a bug smasher carry most of the financial burden.
FTDK