I went down to Anglers Marine today to deliver all the goodies to be installed on my new boat. One thing I found on Brent Ehrler's boat was a device to hold down the trolling motor while running. They also make a product to firmly hold your electronics in place on the console area.
I have since bought the trolling motor locking mechanism (Trol-Lok)

You all might want to check them out...
http://rmcboatworks.com/