When I replaced the crank mechanism I had to remove the small screws that are located on the outside of the hatch cover (2 in front 2 in back). Those screws allow the track to be moved around. I used a ladder and leaned over to the hatch and removed the two small screws in front. I stood up through the escape hatch to remove the two back ones. The ones towards the front of the trailer are a little difficult to line up to reinstalled.
The front screws are easier if you have a magnetic screw driver.
The front screws are easier if you have a magnetic screw driver.