I just got back from a western TAT run that was some of the TAT and some Bobzilla Nevada back country with the 78's and 2 Stovey mounts. All I can say is that the 78 is tits for what we do and the holder that Stovey made is THE SHIT! With many crashes, tipovers ,a few over the bars and assorted poundings, nary a thought to the GPS. The plug on the 78 is the reason you dont want to go with the 62 series. Zero power problems. Mount strayed put and the clips never budged. About the only thing we had no issues with were the GPS and mounts.
Thanks Stovey YOU are the REAL DEAL