I have gone in all of my portable tools to a Ryobi 18 volt li.ion system. It takes 1/2" sockets in the impact driver, and does fine with lug nuts. I use a 1/2" torque wrench on the final tighten, for the lug nuts. This took so far has taken off any thing I need it to.
I do have an air driven impact wrench with a 30 gallon air tank and 120 PSI compressor, which will move almost any bolt. There are special high grade steel sockets designed for impact wrench sets.
I agree that the DeWalt and Snap on tools are going to be better. But at the time the Ryobi had all of the tools I wanted. Plus one of my friends who is a full time RV mechanic said he was getting excellent service out of the Ryobi units. I have yet to have one fail--but if doing over, I probably would go DeWalt.
With the 2 Ryobi batteries and a quick charger, I run my fan, spotlight/trouble light, Sawzall, drill/driver, and impact wrench, which I carry in the truck/some to the boat. I do have a 1/2" to 3/4" drive adaptor, and a few specific size 3/4" size large sockets. But my torque wrench are only 1/2" Drive (20" handle), and 3/8" Drive(17" handle)