Every good adventure starts with...
running out of gas.
You forgot to mention that we made it about 200 miles south on I-5 before noticing that the gas guage was reading very low. Had a little stutter on the hill before the Grant's Pass exit, so we coasted down the hill in neutral. Fortunately the gas station was just beyond the off ramp. After waiting at the stop light, we lurched across the road into the station.
We would continue to get a wonderful 13-14 MPG while towing the trailer.