Over the many years of our road trips, I've evolved from carrying larger pistols to carrying one of my snubs, and sometimes a LCP as an optional choice for even easier LEOSA carry.
For the snub revolvers I typically bring the usual speedstrips I carry, and add a few speedloaders, as well as an extra box of ammunition. The LCP sees an extra magazine and a box of ammunition.
FWIW, I usually pay more attention to choosing a selection of pocket knives. Some of the cities where we stay when out-of-state in the PNW are listed as having blade length restrictions which vary, so I like to have options for when 3" and shorter blades are required. I also like to have options available when it comes to lockblade folders, Trapper folders and SAK's, too.