First: a major thank you to the forum. I would not have bought chains without the advice here.
Second: OMG! Adding chains is like pulling on your spidey suit. The PT1445 now just powers straight up the hills. Mowing 30 degree slopes is no longer scary.
Without chains, mowing thistles on the slope was scary, to put it mildly. The wet sap would cause the tires to slip a little and the brush hog would torque the mower downslope. Occasionally, the tractor would slip sideways as it lost traction. There was never any sign of "getting light" or tipping, just a disconcerting sideways movement. With the chains on, the tractor is stuck to the hillside like glue. It honestly feels like being a gecko; you are just stuck to the hillside.
I bought the european net chains from tirechains.com
SkidSteer Net Tire Chains (Fits the 1445).
These chains have traction links, and come with an integrated tension spring in addition to the cam to tighten the chains. The system looks a little confusing, but print out the photos, and it is straightforward, and quick.
Overall, I think that for me the chains are a phenomenal addition to the PT on slopes. During dry weather, it has always been traction limited on hills, and the chains cure that. In fact, I think that the tractor with chains is less damaging than without, since it doesn't spin out at all. These chains seem to be fine on my asphalt, but mine is weathered, so it doesn't show scuff marks readily. If you have just topcoated your asphalt, I wouldn't bet on it.
The downside? The tractor is stapled to the hillside. I am very glad that I had lots of seat time before getting chains. I can see that with chains, it would be much easier to drive the tractor to the limit (or beyond). With lots of seat time, I think that I have a reasonable feeling for the limits of the machine. If I had had chains earlier, I can see that I might have done some some unsafe maneuvers.
Thanks for the pointers on the chains!
All the best,
Peter