Originally Posted by matt cook
I dont think there is any way road debris could make it from your back wheels to the front of your boat-the angle would be too steep unless your trailer tongue is huge and your boat rides 10' behind your vehicle. I would be more worried about it overhanging on the sides. 12' should be plenty.
I've found road debris IN my boat, so I'd say boats are subject to it. However, I wouldn't be worried about it; the boat will see much worse on the river.
A 12' trailer will be plenty, but if you're concerned and buying new, take your boat with you to the trailer store and try it out.