How much of the trailer should be in the water when retrieving a boat?

When retrieving a boat, typically about one-third to one-half of the trailer's length should be submerged in the water. This allows for easier loading of the boat onto the trailer while ensuring the vehicle remains on stable ground. Adjustments may be necessary based on the boat's size and the launch ramp's slope. Always ensure that the trailer is positioned securely to avoid any slippage.