Which is easier to drive into a tight site - A vs 5th?

I also think length matters. A long rig of any kind will be harder, but especially hard to get into a lot of campsites. Yellowstone has a full hookup park where any length can park, but if you want seclusion in a campsite, the non-hookup campsites won't allow for long rigs. I would get the shortest rig you are comfortable inside with.