On travel days, we find a reststop or similar, and make sandwiches in the back (our old TT or the C).  And as mentioned by the OP, the $5 rotisserie chickens are great...we de-bone before hand and have the chicken in a container that fits our fridge.  Sometimes we can microwave the chicken, add some BBQ, and make a quick BBQ chicken sandwich.  Awesome.
And as mentioned, 1st nite after a long travel day we rarely cook big.  Usually, we will fry up hamburger, add taco seasoning, and do spoon tacos using Frito's.  Takes like 10-15 mins and is fun.