Here's what came up with
Mine sits low with and the engine isn't raised (but it takes mods to do so)
The 30 is cheaper.
So here’s what came up with so far.
The tav30 has the steel back plate, a smaller profile, maybe lighter and cost less. The back plate can crack or buckle in extreme applications. It can be welded.
The tav2 has the aluminum back plate that can be grind down and when setup correctly it can attain 10% overdrive. The tav2 is bulkier and maybe heavier.
After a good amount of price searching narrowed it down to BMI. According to the BMI phone rep she thought the tav2 had some newer technology behind it.
Well even without the newer technology seems the tav30 is hitting its stride at least at BMI. Their tav30s are out of stock as of today.