Hello all we are getting ready to take ownership of a ranger 621 FS. The boat came with a HDS 12 at console and a HDS 9 at the bow. We would like to be able to move the bow unit to the rear for days we are trolling. Does anyone have any advice on a good mount that we can quickly change from the bow to the stern. It seems like people are unhappy with ram mounts. Thanks for any replies.