Hi Marcel,
I started with 8" solid tube then upgraded to 12" solid tube. I chose solid tube because my car is a people mover and space was never an issue. I just couldn't justify the extra cost for something I don't need.
Moving it around in one piece is a challenge, so only do that when I want to move it short distance. I am not small by any standard (6ft 6 and 120kg) but the base size is tne most awkward part. It's very easy to move in two pieces though.
I see that you are in Mornington Pen. so if you want to see it in action then I can bring it along to MPAS public viewing night in Briars. It is held every first Friday of the month. Here is more info:
http://www.mpas.asn.au/PVN.htm. Just let me know (PM) if you are going there and I will take the telescope with me.
Cheers,
Alex