I think your 'house' fuse box is in the converter, right? Your converter's lid/door may contain a diagram of the fuses that tells which holder goes to what, and what size each fuse should be. The fuses may be undersized. Simplistic, but sometimes overlooked.
If it's different fuses that blow at random, you may have a chaffed wiring harness, most likely near the converter. I can't recall either of my RT's wiring layouts from 10 years back, but I suspect they ran the wires in a common bundle leaving the converter, and splitting off as they went close to the various 12V users. I'd start by inspecting that wiring bundle.
Roadtrek _might_ have a wiring diagram on their website. They're better than most RV makers about such stuff, but I dunno how far back their online stuff goes.
Jim, "Leaves don't fall off of trees. They're pushed."