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The surge guard checks what's coming into the trailer. If the problem is after it won't know. Since the GFI is not reading currant, it reads potential between the two sides, I might guess you have a bad neutral or ground connection after the surge protector. The circuit breakers might not trip as they are sensing currant, but the GFI might sense it and not reset. When the DVR burnt up just maybe it caused a loose connection were it connects to the neutral/ground bar.
I would unplug power and go in and tighten all your connections inside the power supply unit. It sounds like you could us a multi meter. I also have a little volt meter that plugs into any outlet.
Best of Luck with it.
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