I'm curious what the wattage of the 12v DC converter has to do with the insurance value of the camper? As noted it's a $163 item at best for the entire power distribution panel.
What we all incorrectly call the "converter" is actually the power distribution panel and the converter itself is a just a little box deep inside it. The one in question will handle 55 amps DC power. Wattage depends on the voltage and this converter has a variable voltage output of at least 13.2v or 726 watts. It goes higher during charging to about 800 watts. Trivia of course. Just like the wattage is trivia for insurance purposes.
On the 120v AC side the panel is normally rated at 30 amps or 3600 watts.
-- Chuck