Even if you don't go with ERA (which will do the heavy lifting for you), Mark Williams Enterprises will set you up with the hi-strength parts should you need to "beef up" your rear. Their web site is actually one of the better ones and you can get an idea what, say, stronger stub axles will cost, or "really stronger" stub axles will cost.
https://www.markwilliams.com/axles.html Every now and then someone will pretzel their half shafts too, but usually it's the stub axles.