Any flavor of Lance's filled cracker sandwiches, Planters Go-Paks (individual trail mix bags), individually wrapped Cinnabun bars, trail bars (the soft, chewing kind not the crispy kind) or you end up with crumbs everywhere including in your BVDs!, juice boxes, coffee in the Thermos made the previous night in camp. DW likes all the fresh finger food sized fruits and veggies. Way too healthy for me. Reminds me of a retired friend for whom the Four Basic Food Groups are salt, sugar, fat and alcohol! - the latter not while driving, hopefully!
Also, The night before we leave home for the first leg or any trip I usually make wraps composed of whole wheat tortillas filled with sliced cheeze, lunch meat, fresh spinach or letuce, mustard, mayo, etc and then rolled up (basically whatever is in the fridge). These are nutricious, tasty, easy to handle one-handed while driving and not messy. I like canned or bottled iced tea on the road for that little rush of caffeine to get you thru the next hundred miles. And, of course, at my age, the best feature of the Casita
is I have my own WC with me at all times!
Of course, there's always the Lucy method of preparing meals on the road as demonstrated in "The Long Trailer".