Hi Ian,
I know the Freedom trolley is an expensive piece of kit but it is well made and also one of the most compact when folded down. If space is an issue, which if you're working from a car then it probably will be, then the Freedom is an excellent choice. The good people at freedom are also very helpful when you need service.
If you've got the right work for it, it will pay for itself fairly quickly.
My work is nearly all terraced work and it works very well for me.