depending on where you camp, like National forests
where generally all sites are DRY camp no hookups, or privately owned campgrounds
the answer varies
generally TENT sites are smaller, private parks don't usually allow RV's into tent sites
some forest campgrounds have tent only area's.. some rangers will allow a small rv there, others will not
there is NO "pat" answer
i have been in National parks, where a tent was in the site next to me
which is generally open camping, its yours if you fit
they arrived after i did, i will avoid anoying tent campers if possible