Much of the advice you are getting in this thread is from folks using blades. You are using a blower, I personally do not think you need chains. Your turfs in the picture will be just fine. I agree with those saying ag tires are not better, especially on hard packed snow or ice. I like the idea of using ATV tires as was suggested.
Unfortunately, if snow conditions are just right, it doesn't matter if the tractor is pushing a blade, bucket, or blower, it's going to break traction. A wind compacted drift will not leave enough loose snow for a blower to keep working. It will carve its shape into the face of the drift and stop. Don't believe me? Search youtube for the "rotary plows" that are used by railways to clear mountain passes. Twenty five hundred horsepower pushed by a pair of 3500 hp, 200 ton engines that can't advance more than a few inches at a crack before backing up to attack again.
The question becomes how much traction can be applied to keep forcing the blower into the snow? There are as many answers as there are varieties of conditions. The simple answer is to load up as much ballast as can be fitted on the tractor safely and select tires that will provide the traction. For most operators, the ballast that can be applied to the tire tread./ground interface is non-variable once installed because the 3PH is utilized for carrying suitcase weights.
In the case of my GT, there is a 250 lb back blade on the 3PH that can be lowered to scrape a wider trail, or raised to increase the ballast load, as the situation warrants. The other end of the tractor has a FEL with a 54" bucket that has been swapped for a 48" blower for one winter. Because the blower was mounted on the FEL, down pressure could be applied to transfer additional weight to the rear wheels. Permanently mounted ballast on the tractor weighed 400 lb. Due to the ability to raise and lower the blower and back blade independently, the actual ballast weight applied to the rear wheels could be varied from as little as 220 lb to more than 1000 lb from the operator's station, much of it while in motion.
While there are tire chains that will work well on lugged tires, they are considerably more expensive than the ladder style of chains that work excellent on turf tires with the wide and relatively smooth tread face. Contrary to popular belief, turfs do not pack up with snow, at least in this area, especially when used in conjunction with chains.
I have the utmost respect for Lance and the experience that he has gained over the years with a number of different tire styles and tread patterns. My experience is limited to basically one tractor and one style of tire (with chains) that will plow through 20" of fresh snow with a 54" bucket while pulling a 5' back blade at the same time for 250'. Since the combination will also pull a 3 ton pickup out of a 1.5' deep, snow filled ditch and through the windrow left by the city plow while working from the polished, hard packed snow road surface, I'm quite happy.
For me, the cheap solution is to use the turfs that came with the tractor, install Rim Guard in the tires, and install 2-link tire chains. Add wheel weights and suitcase weights if that isn't enough for the operator's conditions. My 2wd GT rarely spins its tires. My heavier 4wd SCUT, also FEL and 5' back blade equipped, and with the same tires without chains, spins quire a bit more often.
I'm not saying that other combinations wont work well, only that the combination that I have experience with sets a very high standard for a GT that weighs 2250 lb without the.operator.