Water Heaters For Stationary Airstreams

I need to replace one leaking water heater, and probably should replace the water heater in the second trailer as well (both 6 gallon Atwoods). My situation is somewhat unique in that both coaches are somewhat "attached" to my property and are set up with electric, water, and septic (on 5 acres near Moab, UT...used maybe six spring/fall weeks a year). FWIW, my well water pressure is very good there.

I really like the idea of going tankless, and was looking into possibly electric-only units, but am now learning about the disadvantages of that choice (high voltage requirements, questionable water heating capabilities in colder weather). The trailers are currently hooked up to 30amp power, but I'm reading that I would need 50amp power, and then there might be issues with taking a shower while the AC is on.

I know the Precision Temp units get high marks, but was thinking of maybe going the Girard route (or maybe Atwood), obviously to save a little cash.

Any suggestions (or warnings) would be greatly appreciated.