Yup, never travel alone...
I had to brandish a weapon in a similar situation in '91. We were moving our stuff from Franklin,TN back to MI for a temporary work assignment. Wife was driving our pickup, I was in a Ryder truck. Stopped for gas in some podunk town in northern Indiana 'bout halfway between Indy and Ft. Wayne (~11:30 on a Friday nite). Couple dudes in a late model Camaro got between us and followed my wife out of town back onto I-69. Next thing I know they're pacing her - I couldn't catch up in the Ryder truck, so after watching this for awhile, I flashed my high-beams a couple times to get her attention. She moved to the left lane & slowed down enough for me to catch up and box the Camaro in. The look on the passenger's face when I honked my horn with a cocked stainless 1911 hanging out the window was priceless (it took a lot of restraint not to put a round into the engine compartment - I was majorly po'd). Moments later, the driver of the Camaro decided it would be better to make a Uturn through the median & head back south.
To this day, I have no idea what those clowns were up to, but hopefully they learned a valuable lesson that night. I, for one, was sweating bullets the rest of the way thru Indiana, expecting the State Police to pull me over any moment, but nothing came of it. Course, nowadays, I could get their license number & call the ISP on 'em, but we didn't have cell phones back then...