The Cascade Loop is a perfect vacation for folks looking to travel in their RV. Washington State parks offer a variety of options, many sites with hookups, restrooms and showers. Space reservations are recommended during peak season, and can also be made by calling (888) CAMPOUT.
Some campsites can be reserved for small RV's in National Forests, but most are first come-first served and are mainly designated for tent use. Before planning to camp with your RV in the North Cascades National Park, be sure to check which campgrounds have hookups, dump stations, etc.
There are a number of developed campgrounds built to accommodate Big Rigs with full hookups. As with any road trip, do a little planning ahead of time and you'll have an awesome time!