I'm in the process of forming a public safety dive team in my area. We just won the bid on an inflatable, but don't have any specs on it yet (it's rolled up on the photos and we all know how forthcoming the gov't is with information). I am ASSUMING it is at least 12' length. What size motor should I be looking for in this application? I expect a crew load of five with dive gear for 4, sonar equip, etc.