Water weighs 8 pounds per gallon. 25-50 gallons is between 200 and 400 lbs of water alone. Your wet bath would need to defy the law of gravity to be weight efficient.I have been looking for a small trailer as well. The 2k limit on the hybrid is making it difficult. I like some of the pop up campers but I would like to find something with a wet bath. I will probably be looking for a while.
That's a very well done camper, but I sincerely doubt he's actually below 2000 lbs there, wet. And he had to make some pretty big compromises in amenities to get it that light. Most of my camping will be off the beaten path, and I live in the desert, so carrying more water in and out is pretty critical. Unfortunately, as mentioned, water is heavy. That porta-john would be full and stanky very quickly in the heat around here, and batteries for off-grid power and AC get heavy quickly as well.watch this video one of the best I have seen and under 2k pounds