What I find interesting is that the center of the major burn area looks like there was no connection or fuse (17/18?), although 16 is also fried as is 15 to a lesser amount. The other burn at 9 might indicate something shorting out the two areas, possibly on the back side of the load center. Don't know how much a new one costs, but you might check some of the RV salvage places for a used one. They don't usually go bad or even get damaged in a wreck. I'd think you could probably find the same year, make and model, which would make it easier to replace.
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