I have a solid-tube 8" Skywatcher Dob, and as long as you can comfortably lift 20 to 25 kg in an awkward shape, it's no drama. I find the shape is more a hindrance than the weight; the width of the base puts the centre of gravity further from my body than I like.
When I carry mine to the back yard, there's an awkward flight of steps in the dark so I do it in two trips. The flex-tube might help there. Doing it in two trips is really easy.
May I ask what made you choose the collapsible vs solid-tube?
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