I don't see anything in that reference that would pertain to simple surge protection devices using MOVs. We aren't talking about UPS or switching power supplies - just something to clamp the voltage level and shunt excess to ground.
I agree with Gary. There should be minimal effect having serial protective devices especially since most input power monitors protect for sags/surges/spikes in input power. If there is a defective component after the input device (think one of your switching power supplies shorting and causing a surge inside the boundary), the input line power monitor is not designed to protect from these. Actual point of service surge protectors are fairly good at suppressing spikes and passive MOVs should not greatly change the power waveform.
Based on experience in aircraft electrical and electronic systems, protection was provided by various devices and layers consisting of MOVs, TRANSORBS, SCRs, etc. to protect for everything from defective power to nuclear EMP strikes. These layers were in series and worked quite well.
As Seilerbird asked is the inverter a true sinewave generator or modified (synthesized) sinewave? Modifieds actually have a squarewave component by the nature of their production using some filtering and actual loads to smooth them out. Solid state components designed to work with a pure sinewave may not work as well with modified sinewaves.
Of course that only matters if it isn't a pure sinewave inverter.
The other symptoms at the time are more interesting. They probably were not caused by an external change since your Progressive Industirestm
surge protector gave no indication which places the cause inside the coach.
There was indication of a heavy load at the time of failure as evidenced by dimming lights and sound from the inverter. I would suspect that this load was caused either by the failure of the surge protector that died or the devices plugged into it. You might get a heavier duty surge protector for this circuit...If it occurs again, maybe the actual culprit will fail.