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It's a very good question.
Smaller (<8") sonotube scopes should hold collimation extremely well requiring little or no readjustment after initial alignment. Assuming a good secondary holder is used and properly tensioned and that the primary is fixed in place with locking screws.
However large mirrors on pad floatation systems will move, and truss tube scopes can never be reassembled exactly the same way twice.
The small amount of time (less than 2 minutes with the right tools) required to collimate a large truss tube scope is a small price to pay for such excellent portability.
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