Many truck stops and rest areas have parking spots for big trucks that are pull-thru spots (which are parking spots that are entered from the back and allow the vehicle to exit by continuing straight). Pull-thrus are easier to use and they do not require backing up; some rest areas only have pull-thru parking.
If you are running a straight truck or pulling a single trailer, consider saving the pull-thru parking for multiple-trailer units if you can. If you need a parking spot and the selection is limited, then it is fair to take what you can get unless there are specific rules. But if you can, save the easy-access spots for drivers who may really need them. Plus, this can help keep your backing skills sharp.
