I'm new to camping and it seems all the places I'm am deciding to try whether they are US Forestry, COE and especially State Parks, require a two night stay on the weekends. These are short trips and I do not want to stay two nights. Looks like the only way around it is to pay for two and leave after one night or take a vacation day on Friday and book Thursday night.
Being new - you might find that you really do want to stay 2 nights. Packing and unloading, no matter how simple you make it, is still a nuisance and work for just one sleep over. If you have a great site and are enjoying, you will want to stay as long as possible . (been there - done that!)