I have a 2006 Minn-Kota Edge 55pd. It is mounted to a lockable quick release bracket. The bracket is 13" long x 8" wide. The trolling motor base is only 6" wide so you could go with something a little narrower, no less than 6" though.
Below is about the best picture I have of my trolling motor installed. Note: this picture is prior to remodeling the boat. Trolling motor didn't move during the remodel.
HOI Crappie Club
Where family and friends come to compete for a little more than bragging rights.
Quick, someone teach me how to fish so I can win this tournament!!!