I second what already gone said: Mystik JT-6 Hi- Temp. It's Lith-complex, well proven--and while the discussion is about wheel bearings, one should also realize the JT-6 Hi-Temp #2 meets Spicer's stringent specs. for universal joint grease...and most u-joint specs. are even tougher than wheel bearing manufacturer specs.
Point #2: Another excellent grease is Delo #2 EP Lithium-Complex by Chevron.
Point #3: Actually, you're fine with any grease carrying NLGI certification GC-LB; and finally
Point #4: The ONLY point against the RP listed above (at least for me) is that it is Alumn. Complex. I like Lith-Complex, because most automotive-type greases have traditionally been LC grease, and, like the above-cited poster, LC grease has never 'let me down.' I know a lot of folks use the A-C grease for boat-trailer wheel bearings with great success. And, although the charts say L-C & A-C grease are compatable, if I were to use the Royal Purple on wheel bearings, I would first totally remove all the old (likely) lithium grease from all wheel bearings AND hubs. Otherwise, I agree that the published RP specs. look really good.