I would like to purchase a small (used) outboard as a backup to a 19 ft, 1800lb, deep vee with a 120 Force. We are typically not more than 2 miles from shore. <br /><br />What is the smallest (Hp) motor that we can get away with (5.5, 7.5, 9.9)?<br /><br /><br />(Hmmm, own a 120 Force and...