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On my ROR I use a 50 x 50 x 1.6 Al angle to constrain the 3 x 50mm diameter fixed castors on each side......
I wouldn't worry too much about "locking" the roof between the in/out position - if it is that windy to be a concern - you won't be using it!!
A couple of turnbuckles lock my roof in the closed position.
Been in use in the UK, Belgium and here in Oz for over seven years...no issues, no drama.
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