After potential age/type restrcitions, most campgrounds will "accept" anything that fits in the Park. Public campgrounds in particular have advisory length language in site descriptions but they make no judgement about- or even ask about the size of- your rig.
Where you run into trouble is if you've made reservations, arrive, and find your rig is too big to fit the site reserved. In most cases CG's will try to accommodate you elsewhere. But if they can't: do NOT expect a refund of monies already paid, or to be let off the hook for the rest of your reserved time if they can't re-rent on short notice.
Do your homework or be prepared to take your chances!