If you're considering taking the oar towers off and you use set screws, remember that every time you crank that set screw back in, it drills it's hole a little deeper. Do this enough times and you'll be replacing the siderails on your frame.
Also, soup cans would probably work well on the oarlocks to prevent wear to the upper boat. The soup cans are also a must on the upper boat if you cover the boats with a tarp while it's parked outside the motel - they keep the oarlocks from punching holes in the tarp.
have a good trip!
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse