Do the back seats fold down on a Chevy Express 3500 LS van?

No, the back seats in a Chevy Express 3500 LS van typically do not fold down. The 3500 is usually configured as a work van, prioritizing cargo space over passenger flexibility. While some configurations *might* offer optional folding seats, it's not standard for the LS trim. You'd likely need to look at passenger van versions or check the specific options on the vehicle in question.