Most people who are big into towing don't go with 190s. That is just too much fuel and it will be smokey, or you will have to pull a ton of fuel to even make it possible to tow something that heavy. 190s will haul butt!!! But not a lot of weight, unless you can clean them up with a larger turbo charger and more air flow. Although to a certain extent once you get so big on the turbocharger you will have more lag and it will be easier to get under the turbo and it will make towing and egts even worse.
Also what do you have done to the truck so far?
Maybe I can ask this question. Why 190s? Is it for racing and/or dyno... or are you under the impression that it will tow more?
I don't have a tow queen but I heavy followed many people on this forum and bigger is not always better unless you have LOTS OF MONEY!!!
155/30 and a stage 1 turbo has proven to be a great tow combo. You can actually floor it up hill on a good tune. With 190s you will have to be constantly watching your egts, pulling fuel from the tune, and with a big turbo that can actually clean up your 190s you will lug the motor and fall under the turbo and also have much more turbo lag. No reason to get a giant injector that will just have a ton of fuel pulled on it... Unless you are looking for a major dual purpose truck??? Or if you have a ton of money!
IMO 190/30s, compound turbos, head studded and complete bullet proof, ported intake, ported heads, aftermarket air intake, complete fuel system, regulated return, water/meth injection, a fresh hpop (needs to be in good condition), a built tranny etc.. etc.. This would be one mean towing machine
Or you could just do 155/30 and a stage 1 and have almost the same towing ability