Dormobile bunk covers - what are the 2 turnlocks for?

[VeeDubMan]

Just getting my bunks back in and can't for the life of me recall why there are two rows of turnlocks on the bunk covers.

Take a look at

for example. I know the 'unfinished' edge gets clamped by the plastic strip, the cover then goes over the bunk but then there are two rows of turnlock holes. What goes where?

 

[Trikky2]

It fastens back onto the roof aperture edge to cover the bunks when stowed. Second row of turn locks gives enough extra to include the sleeping bags if you wish to leave them up there.

 

[VeeDubMan]

Second row of turn locks gives enough extra to include the sleeping bags if you wish to leave them up there.

Knew you'd have the answer

I was just cleaning my teeth this morning and came to the same conclusion. I might make the gap to the second row a bit wider so I can fold the kids away with their sleeping bags too!!