I'm looking at new A/T LT tires too, and found this test very interesting, and well carried out.
http://expeditionportal.com/where-the-rubber-meets-the-road/
Seems the Cooper Discoverer A/T3 is a very impressive tire with an LT and M/S rating. It comes in a bunch of 17" sizes, the one that looks to be a good fit is LT225/75-17. 30.35" tall, with a tread width of 7.01" which is more than most 235's. And I think it should work in the treg with chains.
I'll be replacing 235/65-17 Nokian WR G2's, that I use as my winter/FSR tires (and 5.5mm diamondback LT chains for all four corners).

 

I run Nokian 235/65-17 Rotiiva AT tyres for a)ability to legally fit chains and b) snow rating during the winters over here. The G2's or any such specialised Nokian snow tyres over here are veeery expensive.

 

I'm running BFG AT KO2's in the 245/70R17 size on my T3. That's a 30.5" tire so a bit larger than stock. I did some 5/10 off-roading in Utah last month with great results. Had 2 wheels in the air at one point, but the point of the LT tires is more ground clearance and stronger 10-ply construction and I'm happy with the choice. Everybody in the "overlanding" crowd seems to be running these now.

The biggest positive is that I'm no longer paranoid about punctures, but other positives: Very strong tire that airs down well without losing sidewall height, good tracking on the highway, hasn't really affected gas mileage much (in this size).

Negatives: Loses grip on pavement with little warning (this is pretty common with LT tires vs Passenger all-season radials), snowflake rated but is not really that great in snow although still better than all-season tires, definitely noisier, but you get used to it.

I run 48 lbs in the back and 42 in the front. At 48 in the front it wanders around a bit at 70+ mph so I aired it down to the same ratio as the stock setup has (42/48 vs 33/38 ) and it's now just like it was with stock passenger tires. You need to run the higher pressures to match the load carrying capacity of the stock tires.

The speedometer now reads about 2 mph slow at 70. The average MPG readout is now 10% low vs. hand-calculated.

 

I am currently using Pirelli Scorpion ATR same as yours. Still remain happy that I chose these. Minimal road noise and good grip in all conditions and surfaces that I drive.

Previously I had Bridgestone D 697 AT tyres that were very noisy. I replaced these before they were worn out. When I was shopping for these I noticed that they had a LT AT version that would have suited, however at the time they did not have stock. These tyres were good in every other respect, apart from the noise.

After this experience I would always choose the Scorpion ATR as my first preference for the Touareg. No doubt there are others just as good but I would not be keen to risk the cash to find out.

 

Thanks guys for input.
I settled on another set of the Scorpions. Decided the last set served me well so why switch to LT unless I really need them.
That they have reduced in price by nearly $50 each since my last set was nice too.