The Guvnor,
I believe wing-mounted AAR pods were never fitted to the Timmies because of the -500's active control technology. Wind-tunnel studies showed that the wake from the constantly moving ailerons would not allow the drogue to be stable. In order to get the drogue below the aileron wake the pylons would have been ridiculously large - i.e. there would be inadequate ground clearance for the AAR pod.
