Traveling to the San Juan's requires a starting point,
a jump off point where you can leave your rig.
"Washington Park" and "Cap Sante Boat Haven" in Anacortes fill the bill.
Washington Park has a campground
and a boat ramp with a float. You can reserve your campsite in advance, launch and retrieve your boat every day to make day trips or take an extended cruise into the islands knowing your campground is waiting for you when you return. You may also choose to not stay at the campground, just launch your boat, and leave your car and trailer in the long-term parking lot while you're in the San Juans.
Cap Sante does not have a ramp but has a sling
and a travel lift to launch your boat, they can also assist in stepping sailboat masts. Guest space is usually available at the dock and long-term parking for your car and trailer are just steps away. You should make arrangements ahead of time for the travel lift and guest docks
There are several other places I recommend over these two depending on where I'm going and other plans.
Take a look at this post >> Trailer boat ramps
