Originally Posted by Sailormon6
If the trailor has rollers rather than bunks, painting the bottom is easy. Paint the bottom except for the area under the rollers. Hook the trailer to the tow vehicle. Lower the keel support bar. Let out about 12" of the trailer winch cable. Put the tow vehicle in reverse and get the trailer rolling backwards slowly. Step on the brakes enough to cause the boat to roll back on the trailer. You might have to let out a little more cable and do it a second time to move it back a total of about 15-18". Paint the area under the rollers and let it dry thoroughly. Use the trailer crank to move the boat forward on the trailer. Don't forget to raise the keel support bar.
9 out of 10 times this might be successful, but the 10th time could cause some damage or someone could get hurt. You are dealing with a lot of weight and therefore a lot of inertia. Just think what would happen if the winch cable came loose or snapped--boat on ground lying on its side. This needs to be done with boat jacks, not sliding the boat around on the trailer by jamming on the brakes!