For sure get your tires balanced first as aztoytec mentioned, then go from there. I'm in ICT and happy to help if you're still battling the vibration after a balance, shoot me a PM.
I went with the MetalTech hitch as I don't have plans to max out the towing capacity. It's a solid build as expected from the folks at MetalTech. If you have slightly larger tires in your future and plan to mount it underneath here's a heads up. My only niggle is the bottom flange of the hitch...
The 470 xfer is a VF4BM the same as the V8 4Rnr and certain FJC's.
If memory serves the 460's have a different version of the VF4
Not sure on the NV4500 adapter but I doubt anyone has gone down that path yet. Ignoring cost, there are likely OE MT's that bolt up the 2UZ just not in the US.