I have been following your posts for months prior to making the big decision. Just put down deposit yesterday on a PE black RT-S and trailer. When it arrives, I want to install a GPS on the ST and save some money. I have seen the Garmin 660 GPS on Ebay in the mid $600 range (compared to the $1200 the dealer wants). Does anyone have experience mounting this GPS on the RT as pictured in the Spyder sales catalog? Does the 660 come with the mount used by the dealer or is this a seperate purchase? Thanks for any help.