oversized 60ft +towing a car

[kingsmusician]

What is the average length of the campsites ?

[enblethen]

60 feet plus a car?
That would make you illegal in many states just driving down the road.
What is your total length?

[kregli]

42.73935 ft

Seriously, you'll have to check with each campground you might visit. The overviews on the Good Sam site will give you an idea. There are many that can handle your rig, but most can't. I stayed in two campgrounds owned by the same people and about 50 miles apart. Both said they could handle "Big Rigs". In one the largest space was a 45 feet long back-in site; in the other almost all the spaces were 90 foot pull-thru sites.

[n7bsn]

Where?

Older campgrounds, I've seen as short as 30 ft.

I've also seen as long as 100 ft