You have a lot of good answers.
In our C the passenger can easily move from front to back.
Never a good idea while moving regardless of class.
I have found the best service is from independent trucking centers.
They will work on either as the see both in other forms.
My suggestion would be to rent one for a short trip of each if passable
and see how it works for you. Take your time in making a decision.
Our in-laws had several different styles and sizes of each when they were living. We decided that a small C fit us best for what we wanted to do.