You may need to base your loading on those photo's, the inner dome rings (3 of them), the shutters (upper and lower) and the inner wall join covers may be able to be stored in the bottom of the trailer, if the manual is available, make sure you get it, you will need to follow it carefully when you put the upper shutter on again, there will also be a few odds and ends that will need to be packed as well as all the nuts, bolts and flat washers etc.
Have fun
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Cheers