We are a group of two traveling with a truck towing a 21 foot trailer. We booked a pull through site (plenty of these and more back-ins) and it fit boats the truck and trailer. All parking spots are well marked. Clean area with picnic table and fire pit. Something to note is we wish we brought our bikes. The park is so big and we didn’t get to explore beyond the RV parking area into the state park area. If you have a chance visit the maritime museum in Astoria. There’s also a laundromat outside the park that we’d definitely use again. It was super clean and convenient to get to.