Got a useful tip from a friend. Use large dog pee pads around the door and up to the sink area. They catch grass bits and mud. Also dries my dogs feet somewhat when she runs in the trailer.
You can shake them out in the morning and throw away when dirty. I bought my tab 400 new with a cream color floor. The first thing I did was put down an offcut from Home Depot of grey water resistant floor runner. It runs the entire length and a little bit to the door. Also I bought a clear rubber bath mat and cut hole for drain. Protects wetbath if I have to run to pee too desperate to remove shoes first. :-)