I had my dealer install my HW50 after the transfer switch. My thinking was it would protect everything from the input be it shore power or generator.
Low and behold my first time at an Air Force Base in Colorado and we get a couple of power surges (on/off/on/off) during a storm. Fried the transfer switch and the HW50. Nothing wrong with anything in the camper.
Purchased a new transfer switch and a new HW50 This time I installed it before the transfer switch. I don't use the generator but a few times a year. We don't dry camp, but I use it during shore power outages. Generator has built in protection (Onan 5500).
You can protect everything, but at what cost...
2014 Dynamax Trilogy 3850RL - South Hampton Interior, Full Body Paint (Black / Silver / White), MOR/ryde Independent Suspension, MOR/ryde Disc Brakes, ONAN 5500 Generator, Progressive Industries HW50C w/Dual Display, Winegard HD Dish w/DirecTV, Washer & Dryer, iSprings 7-stage Reverse Osmosis Water Filter, Trail-Air Flex Air Pin Box, Third AC installed, AC Voltage/Amp Meters, DC Amp Meter.
Retired USAF - Full Timers!