Well I thought I would give a quick update.
I took this new observing chair / trolley out to cambroon on Saturday night, and I was quite happy with it.
It was easily sturdy enough once you had leaned forward to rest on the trolly platform (not on wheels). I did find it a little heavy to move around but no more so then most observing chairs. The benifit of my one I quess is that it has wheels

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By having this chair it made observing much easier and comfortable! I could sit for much longer and steadier than before.
I found changing heights easy in the dark and it all packed away small enough for my car.
Overall... a success!