The ferry thet "flyswatter mentioned is actually from Mukilteo (west of Everett) across to Clinton (at the southern tip of Whidbey Island) from where it's about a 45-minute drive north to Anacortes.
There's a campground on the outskirts of Anacortes that is specifically designed for big rigs. It's called "Fidalgo Bay RV Resort" and has 142 sites, according to their Yellow Pages ad. It's owned and operated by the Samish Indian Nation and is very popular (often full). Their web-site is www.fidalgobay.com.
We actually live in Anacortes. We moved here in 1999 after I retired from Boeing. We're about 3/4 of a mile from the State Ferry Terminal, so we've never stayed at Fidalgo Bay Resort. The resort is rather flat and the sites are fairly closely spaced, but it's on the water's edge and has a walking/biking trail at the landward side that goes all the way into downtown.
Anacortes is a good base for seeing the northern parts of western WA, but it's close to 90 miles from the city of Seattle and about the same to Vancouver BC. It is the "Gateway to the San Juan Islands" (it's actually on the only one of them you can drive to) and this part of the state is the most scenic.
If you'd like more info on this area or the Everett area, please send me a PM.
Frank Damp, DW - Eileen, pet - female Labrador (10 yrs old), location Anacortes, WA, retired RVers (since Dec 2014)