Maybe you could cut out the bottom of the bucket then cut a hole in the floor of the trailer just big enough for the bottom edge of the bucket to fit. Then the taper of the bucket will wedge into the hole in the floor and you have a mobile pit toilet.
![Cheese! :cheese:](https://board.marlincrawler.com/Smileys/marlin/cheese.gif)
This will also net you a spill proff Paco approved Poo-Bucket. Just don't let Paco play in it after it gets used.