We have stayed at Ainsworth many times one of our favorite campgrounds in the Columbia Gorge where I grew up. It used to be a no reservation campground but now takes reservations and does have some pull through big rig full service sites. The entrance is just off the 84 and need to make sure you don't get on the old highway which is not big rig friendly. Very close to Multnomah falls which has parking for RVs but is a left lane turn then a tunnel to walk to the visitor center. If you want to cross over the river to visit Beacon Rock don't use the Hood River bridge use the Bridge of the Gods. Never solved the Portland Traffic problem just put up with it no easy way from east to west. Lots to see and do in the gorge.