Looks like those Alcoa's will be put to good use towing that GN, Looks sweet!! I had the chrome Outlaw 2's on my truck, one cracked on the front right side. I was looking for a leak in the tire for days before my hand ran across it on the rim.
That's the only time I've cracked any rim. Those rims came with the truck and it was used for logging in Oregon for its first 16 years so who knows what kind of abuse they took. I'm going to say that aftermarket steel rims may be among the worst quality there is. Those Alcoa's are probably the best rim out there for weight carrying. You now have a safer truck for running your new setup and it looks great as well. Good luck with it!!