Good catch on the metrics issue.
My Cuz was up from Oregon a while ago and we were out looking at his new truck. I noticed he had a piece of masking tape on the dash with the metric equivalent of the height of his 5th Wheel. He said he didnt want to screw up spending down the Hwy and co e to an overpass that was in Metric, so he wrote it down and stuck it to the dash in front of him.
He also has printed a cheat sheet ( metric conversion) that showed how many feet in a meter, liter to gals etc...
Back to the 50 amp service that you say your rig has:
Is your fridge:
A two way fridge, 110 and Propane
A three way , 110, Propane , and 12 volt
A one way, 110