I read the lengthy posts on how to update my 2010 Gl. Both legal and not so much above board. Decided for different reasons to opt for a TomTom 400. Want to be able to switch between multiple bikes and cages. Is it just me or do I need to hard wire a base unit to each bike? Ram ball mounts with a a suction cup work with an auxiliary port in the glove box. Any help or experience would be appreciated.