This is an older post but important and valid.
I talked with a guy at the CG I stayed at last weekend who has the Progressive model, with the remote monitor unit. His trips alot, he also thought "I don't have trouble at the campgrounds I stay at..." The monitor tells you the incoming voltage and trips when too low or too high and doesn't come back on until voltage stabilizes for 2 minutes.
He stated that he was really concerned that it was not working right when he first installed it because of just how many times it does trip. He called the company and talked to the owner who just happened to answer the phone. He said the monitor is telling the story reading the actual incoming voltage and you probably never noticed the issue before because most things inside the RV are running off the battery anyway, but your converter is taking a beating all the time. He said the voltage dropped below the 104V threshold many many times.
All things considered and the fact that I will be living full time in mine for almost the next year, I would rather just install one and protect what I have.
I'm buying and installing the Progressive model... he also said the ones that you plug into to shore power and then plug the RV into get stolen ALOT!!!
It will be installed in the power cord access door on the back wall with a new shore power cord (mine is pulling off the end)...