Klahowya Campground has 55 single sites and one double site, all of which are first-come, first-served, and none of which have RV hookups. RVs and trailers are welcome, however; most of the sites can accommodate 30-foot vehicles, and a few can accommodate 40-foot vehicles. Aside from the standard configuration of picnic tables and fire rings, Klahowya has potable water, vault toilets, a boat ramp for floating the Sol Duc at lower flows, and a small interpretive path at the south end of the campground.

Stayed there 3 nights ago. Dont know the exact size rig max but depending in the site it will depend. I was in a space that couldn’t have had anything longer than my tacoma. But other sites i saw some decent size trailers. Some even have hookups. I posted a pic of the site map, there were a few pull through sites that might work for something big.