I think just about any site will accommodate a 3 person tent. Some might be a little tight. I some times take what REI called a 4 person tent. It can hold 4 if they are cheek to jowl but it sleeps 3 OK and 2 real nice. It seems to fit every where I've taken it.
Try to fit it on the pad without required folks to step outside the site. Many sites a marked with logs and it's a definite no-no to move the logs or trample around the outside. Take the word of someone who knows!
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