RV inspections

Pennsylvania has been inspecting trailers over 300# for many years. They check the brakes, tires, lights, and battery for the emergency braking and the hookup between the trailer and truck for braking and lights. Here if you fail for something you can take it out and fix it and bring it back and get your sticker.
Generally if it is a small repair it is cheaper to let them fix it than the cost of fuel to go back and forth. LOL.