I called Progressive about this issue, (using two EU2000i Honda gens and getting E2 error message), the tech guy said OK to use bypass switch, still have surge protection, bonded neutral plug is work around to fool the EMS.
I did some research, I'm very light on electrical stuff, so doing anything to modify how my Honda Gens are connected to trailer is questionable to me. The more I looked, the more confusing it was. In short, the "experts" don't agree.
So, I'm going with the bypass switch.
These Honda generators are designed and made to be used with RV's, and Honda is know for quality. Electricity from Honda gen may be the most reliable electricity your trailer ever gets. Best I can tell, you don't need a surge protector for your generator, so bypassing EMS seems easier/ better solution to me.
I already had one EU2000i gen I used for my Casita, and it worked great, weighs approx 45 lbs, not easy to move, but OK for me. I use the A/C all night from time to time at my place with no electricity. After doing some research on what to do to run Escape 21 A/C, it seemed easiest to get the companion gen and go with 2 gens wired together. Have used it a few times, works great.
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