When I've done STP (with wife), we stayed at the Assembly of God Church in Vader. Volunteers drove us to local houses for showers, they fed us (humongous meal- there were leftover desserts!), and we slept in our sleeping bags in the sanctuary. Aside from luggage logistics, it was luxurious. Vader is at 124 miles, so the next day is comparatively easy. The hills just before Longview are a great warm-up, and you're on Highway 30 before there hordes who stopped in Centralia get there.