Where I put my boat in, the water level isn't that deep and I have a hard time getting the boat (15' Aluminum flat bottom Grumman) off and on the trailer. I noticed the bunks are attached with adjustable brackets that hold the bunks up off the frame about an inch or so. Before making any changes, I just looked at pictures on line of other set ups like mine and all the bunks I see are also raised up. Does it matter? can I lower the brackets so the bunks sit right on the frame?