Cooper Discoverer A/T3's, question?

I searched but didn't find reference to this tire. I have been looking for a tire that is Great on wet roads, with a little off roading when fishing or hunting. This is usually going across fields and such, Not a big problem, or driving around stuck traffic that the state allows them to use in SNOW, completely bald, 4x4 handles that !

Rarely get more than a foot of snow so the 4x4 handles that OK.
However finding a tread that works "GREAT" in the rain/slush snow is a problem on wet roads.
I have a 2001 Tacoma 4x4 TRD Limited, running 265/70/16 tires.

I am thinking I would like to switch "backwards" to 15" wheels and tires, I like the "Look" better and the ride.

Looking for advise on the Cooper Discoverer AT3 tires or whatever!

Also recommendations on quality 15 inch wheel (aluminium) manufactures .