I just ordered an Orion XS. Gonna hook replace my Victron 12/12 18A that is installed in the trailer and connected to the 7 pin factory line from the truck. That line is 10ga with a 30A fuse.
I'm gonna set the input current on the Orion XS to 30A and see what happens. The 12/12 18A draws 22A from the truck to make 14.2V @ 18A on the output. I'm guessing the best I will see from the Orion XS is 14.2V @ 22-24A. Then I will do what you recommend and see if I can actually get 50A from the Orion XS. My alternator is only 160A and it's dumb. That should be enough to handle the Orion XS with proper wiring.
Geesh, just ran the voltage drop calculator and it recommends 2 ga wire for the 20 ft run.
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