If transport is a problem with a solid tube, here is a solution if you are confident with tools, even a little:
You can purchase the 12" solid, & convert it to a truss scope. It is not overly complicated, & plenty of help is at hand. My first dob is one I made myself, a 10". Bought the optics, built everything else. Just did my homework before I got to it. I'll be doing this with my 17.5", it is just too big & heavy as a solid tube. The satisfaction is incalculable.
It also can be done over a period of time (kids needs), & you can use just about all the components from the solid scope, like optics, finder, mirror cell (most difficult item to get right), spider, teflon bearings, etc.
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