Not to nitpick, but that's a rough dirt road/easy trail. I have done it in all my Subarus multiple times. It is more of an easy trail now, but not approaching moderate. Moderate in that area are Diamonback Gulch aka Greasy Spoon and Outlaw, on both of which a Limited should have no problem. I would also take it on Oak Creek Homestead aka Cliffhanger, which is rated difficult but in fact is moderate. A carefully driven Limited should survive the harder trails in the area, Broken Arrow and Red Rock Powerline with minor scraping, maybe a bruised valance and/or flattened exhaust tip but that's it.
Any 4Runner's baseline is far above Schenbly Hill. That's a stock Subaru baseline. I know it is getting rougher and that it is extremely bumpy and annoying, but that's not the same as hard for the vehicle and it is so wide it will take a long time to become moderate.
My point was that, by contrast, the 21 degree AA limits the GX 460 in a way that is completely incomprehensible considering the platform and the 4WD system it has. It would be like putting Wrangler angles on a Subaru AWD. It is a complete mis-match between traction and clearance, which tells you what Toyota thinks of the way it is used. The 2010-12 GX 460 had better angles, enough for any moderate trail I have seen in the SW.