Ah yeah i can imagine it’s a little sketchy when dealing with the full length of it all. I’ll probably convert mine over to a similar setup as yours next spring, anchor plate for the class a. I want to add another couple feet for good measure and need to add a brace as well. Just a tricky spot on the roof for a ladderI pulled it all off, added the additional height and then put it back on. It was not as easy as that though. Total weight is probably only 60lbs but cantilever stuff out 9.5 ft and you can imagine how you have to wrestle with it. Disclaimer, if I didn't go to the gym religiously it would have been a lot harder.
These don't twist together. It's 3 screws per connection. The slip fit is pretty tight though. They came apart relatively easily after a year.