I’m going up there in July and may bring my RV. I understand the sites have no electric/water hook up (which is fine) but are the sites big enough for my 26ft ever?

Most sites are big enough, some spaces are kind of tight getting in. If you are good at backing it in, then you should be fine haha

Watch for low branches.

Some of the sites will work. We camped with our 30 ft worth no issues.