The Toyota E-Locker is plenty strong. I ran them front and rear on very heavy 37" tires and they did great. The bad rap they get is from people not utilizing the proper length shafts to engage the side gears fully. When you use the correct shafts they are the best locker option for the 8". Mine instantly locked up, never let me down (except for my dumbass frying an actuator when I had an exposed wire and actuated it underwater), the actuators are easy as hell to rebuild (literally a 30 minute job), and one of the biggest bonuses is the fact that you can pull your actuator off with a couple of bolts and manually lock and unlock the locker if the actuator ever has a problem. I wish there was a Dana equivalent as I would be running it in my new truck's axles.
If you don't believe me then reach out to Zuk of gearinstalls.com. No one knows Toyota 3rds better than him and he'll tell you the same thing.
Axle shafts? Does that mean you have to replace your axle shafts if you retrofit the Toyota e-locker in a standard 8" axle?