Cheese sticks, precut celery, presliced mushrooms, 100 calorie packs of nuts (or bag up your own ahead), grape tomatoes. Protein bars for meals. I keep the cooler right on the passenger seat. I love bringing baby peppers on road trips, but they're hard to eat while driving, so I save them for snacks after I arrive.
Lost the first 100 with Medifast, now working on the last 25