Nope. And I know what would happen, assuming it was a major traffic jam:
You let one person in, then another comes up and asks "why did you let them go and not me?"... then you soon have a line out the door. Then your TP runs out because someone used a large amount to buff their bum to a high polish. Someone goes rummaging through your cabinet looking for any disposable paper to use. Soon, you find out that your black tank is completely full because people are using your bathtub to do #1 in and complaining of the smell. Now, your black tank is overflowing into the toilet and cannot be dumped, because the sheer amount of TP (and paper towels) used, which requires you to stick a paint stirrer on a cordless drill down in it in an effort to try to break up what the heck people threw down there.
To boot, unless you are watching, people will happily help themselves to any free items, or just raid your fridge claiming they are hot/thirsty.
Then you go to dump, and learn the real fun: Someone decided to use feminine hygiene products and tossed them down there, so you are picking out red/brown stained cotton out of the impeller of your macerator pump.
My excuse, "sorry, no toilet present", and I don't allow them to verify the veracity of that statement. If I said no flushable water was available, people would use that as an invite for doing #1. Let them be angry... better that than dealing with an empty pantry, fridge, and cabinets, a gray tank full of human waste, and a clogged, overflowing black tank.
