Just got a great deal on a leftover 15hp mercury 4 stroke electric start. ordered a bracket for my Islander rated for 15 hp and 40 lbs more than the motor weighs. Small print on the motor bracket. Trailering with outboard mouned on th bracket not reccomended.I can't take it off every time i want to trailer it. It's an expensive, brand name prouct. Any Ideas? Can I just brace the motor from underneath?