Much depends on the city. The older citys east were not laid out with todays vehicles in mind. This may be fine for drivers with the local knowledge for getting around. No so easy for the visitor unfamiliar with what is where & how to get there with his home on wheels.
In the new citys west of the Mississippi there is much more room. Streets are wider. Just a whole lot easier getting around.
Finding a CG near downtown in an eastern city is going to be a tough find. Better to find one outside near public transportation.
A western city, especially a smaller one will not have very good public transport but the chances of getting a CG close to the city center are better.