Had 10' era Yukon 5.29s with solid spacers F/R in elockers on my fat 2nd gen that was treated like a rental. Broke 2 sets of rear gears but can't really fault them with the treatment and neglect under a 45-4800lb rig.
Nitro was put in with all new bearings for this last round so we'll see.
G2/Motive seem to be thought of as the "best".
Nitro seem to be good and available.
Yukon obviously works with a decent setup.
3 parts to getting an 8" to survive seem to be good setup, use solid pinion spacer and get good center preload to reduce deflection.