I just realized something else:
The water heater bypass!
When I bought my old trailer from the original owner, he gave me a piece of pipe with some fittings on it. To winterize, I had to crawl under the bed/sofa and disconnect the water heater. Then install the bypass pipe. Two years later I installed a bypass kit that used 2 two-way valves that I could barely tell which way they were set. (flipping 2 valves was a MAJOR improvement over installing/deinstalling that pipe)
The new trailer? 3 standard valves that are blatantly obvious about their mode.
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!