My tanker is Electric Armor, and it has a lot of built in Endurance and Recovery resistance, which I increased not on purpose but because it came from the same powers as other stats I wanted to up. I'm sitting at 216% Endurance resistance, and 129% Recovery resistance. Its probably overkill!
But one of the Scirocco patron arc missions was 100% Mu, and I ran it on +4x8 without any problems, and I can pretty much ignore sappers while carnie deaths do nothing to me.
So Rad armor isn't the -only- answer here 😄