How often do you have two cars or guests?

Never.

When at our local go-to camping place almost always. When we travel seldom.

Not everyone travels hours away from home to go camping.

Visitors? Brahahahahahahahaha

We tried to get the in laws to come with us once. It got as far as us saying the roads were dirt, not pavement. It seems the closest thing their Denali had been off road was Pop pulling over to the shoulder once.

Very seldom. I tell our guests to use the over flow parking lot.

Never for longer than a few hours, if visitors come out. However, in the public campgrounds I use, it is pretty common for someone to set up a single RV, or two RVs in adjoining spaces, and over the weekend have 5-6 cars worth of visitors out for a BBQ or party at the lake.

Never, we have guests use the overflow parking as requested by most parks.

We will often stay at a campground when traveling to visit friends and relatives. That could mean a few extra vehicles at our site, or elsewhere within the campground while the visit is on.

When we visit family sometimes they come visit us at the campground. I see lots of grandparents camping near relatives and the whole family comes in multiple vehicles with many grandkids to play in the pool, especially on holidays or weekends. It doesn't bother us because we know they go back to work or school on Monday.

Depends if we are going to work from camp, we may have 2 vehicles.

I have a friend that stops by almost every evening for Happy Hour at my 7 month winter spot.
So 2 cars then. The other 5 months of travel maybe 30 days with 2 cars or more.