Hi Suzy,
I know a woman who has a 10" solid tube dob and she says that she can lift it in and out of her car boot ok.
I think she collimates it each time it is used, at least after a ride in the car.
She uses it on a regular basis at the local astro clubs dark sky site.
I have a 5inch dob and plan to keep using it for quite some time yet, but when I do finally upgrade I'll be going through what you're going through now. And I'm terrible at making decisions!
So this thread is providing me with much interesting reading which I'll be filing away for the future.
Good luck with your decision.
