Don't have a longarm, and would rather have a new car. Besides, a car takes less room.
I do all my free motion quilting on my tiny vintage Featherweight. I baste very well, and only use a nice thin batting, like warm & natural.
The quilting is done in the lower right quarter.
My quilting surface is raised to the level of the sewing bed by way of a couple of sheets of foam insulation atop a dining table, giving me a large areas of support.
I start by rolling my quilt. As I get into the project, it becomes more of a fan fold. I posted pics here:
http://www.quiltingboard.com/t-62061-1.htm