I think this is a great idea to use in your trailer for doing dishes. I don’t use a dish drain but a large dish towel folded up.
Anything you can do to reduce risk of water going anywhere and avoiding mold or mildew is worth looking into. I do get a bit of a problem with water from the sink and wet dishes going in behind my Fleetwood trailer sink area and “mop” up often.
This idea looks like it would solve a bunch of issues for me. Its easy to store and works well.
The genius behiond this idea is Linda at LindaMade. You can get pattern and full instructions for making this dish drain on her site.