Thanks for the info
I'm still looking further to a right design for my truss dobson. I want to use my mirror from my Skywatcher 8 inch and it's a F/6. So that isn't really ideal.
Yesterday I looked on the net and found this telescope
http://www.stathis-firstlight.de/atm/index.htm Push 6.6 inch twins to the left.
It's still transportabel but the balance can be changed afterwards.
Thanks,