Ride with the trucks or let them pass by?

Here in California the speed limit when towing is 55 mph, although almost everyone exceeds that. I like towing at 58 mph, but have observed that vehicles overtaking me often come up too close for comfort before changing lanes. But if I tuck in behind a big rig going about the speed I like, faster vehicles seem to move over much earlier. They see a big rig in their lane and seem to plan earlier to change lanes than when they see my little 'ol travel trailer on its own.

Bruce