Highway 1 is really something to see, but I'd leave the 5er behind when you drive that route on the northern segment (north of San Francisco), US 101 is a fine road and will present no problems for either rig you are considering. Highway 1 south of Monterey is OK for your 5er, nice scenery down by Hearst Castle and viewing the elephant seals on the beach is something to add to your journey. Nice private RV park in Paso Robles to the east of Morro Bay and San Simeon. Don't think your'e going to have any trouble getting a campsite during weekdays, but Fri/Sat nights might be a problem along the Oregon coast close to the Portland area. Should be no problem down by Brookings area though. Fuel up in Brookings before heading into California, save a few bucks!