Hello Rick:
When I travel to Paso Robles we go up I-5 to Lost Hills, Highway 46 and go west to the campground. Not as scenic as 101 a little faster and avoids a lot of traffic.

There are also several truck stops on I-5.

There is one in Castaic, a Flying J in Frasier Park about three in Lebec a Pilot and a TA, (just north of the Grapevine) and a couple in Lost Hills at highway 46 a Loves and a Petro. We will see you in Paso Robles.