I'm lefthand dominant, so car carry isn't as big a problem for me as it is you "righties."
Thus, the seat belt buckle doesn't interfere with belt or waist carry and there are several places I can carry on my left side that are effective.
1. I always carry an Airweight J-frame in my front left pocket. If someone carjacks the car and forces me to get out at gun point, the car is theirs . . . NO PROBLEM . . .
I just back away until they step in . . . take a step towards the back of the car . . . and draw the J-frame before they put it in gear. If this ever happens the trigger will be stroked double action as the muzzle comes up.
I also carry a chopped barrel Model 25-2 revolver, in .45ACP, in the glovebox, along with a tray of moonclips with various loads in the slim chance that someone might attack me while the car is rolling in traffic. Some loads are great against auto bodies, and some are self-defense hollowpoints.
Generally, I also have my main CCW gun in the car also . . . a Kimber Ultra CDP .45 auto with nightsights, plus a powerful personal flashlight and a Spiderco folder.
In the trunk? If traveling on trips . . . a trusty Ithaca Model 37 DSPS Police Special, 20 in barreled 12 gauge shotgun stoked with slugs but topped with 000 buckshot . . . and a fire extinguisher in case I come upon a wreck and a car is on fire.
No . . . I'm not paranoid at all . . . I'm just trying to be prepared. It is always better to be safe than sorry!
T.
PS: I also CAREFULLY review each state's unique gun laws before taking a trip through different states . . . and follow each state's laws to the letter. There is NO EXCUSE if someone fails to follow any state's unique concealment carry of weapons within THEIR state.
T.