I know this is relative to the ramp you are using but those with RT188's, on a typical ramp of 10-15 degrees, what are you using as an indicator of how deep to back the trailer in, tires covered, 3/4 covered? Side guides x inches above the water surface? Do you find the same depth allows both launching and power loading? Do you find that at the correct depth you still have room to walk behind your truck without getting your feet wet?