We have camped at every Oregon State Park on the coast..to answer your question...yes, you can put up as many tents on your site anywhere that they will fit...but only 1 RV.
Up to 8 people per site are permitted with no restriction how to sleep those people.. We have even seen people sleeping on the picnic table!!
"If we couldn't laugh we would all go insane."
Arctic Fox 25Y
GMC Duramax
Blue Ox SwayPro