Basic road trip for shopping, sightseeing etc;
pistol with extra mag and a 50 round box of reloads. Each vehicle always has a 50 round box of 9mm, 22, 223 and 38. (reloads)

Camping trip;
same daily load out of ccw glock. Usually will take the AR/A2 and some extra ammo/mags. Might also throw in the wife's handgun now that she's got the ccw license.

Long road trip across states;
basic ccw loadout listed above^