I was a tire consultant for a number of years, specializing in tread designs. As for radial tires, they, for the most part offer all of the same advantages. The one difference between them is tread design. Now this relates to tires of the same quality...not, say comparing a Goodyear to one out of China.
The part of your thread where you mention the difference in tread depths of 4/32s greater between 2 tires is a false positive. Because it appears you put a bunch of miles on annually and run mostly unloaded, so pick either and don't second guess your choice. However...when choosing the deeper tread design in some cases it can work against you, and that would be if most of it was as loaded miles. That requires a in depth explanation...so to shorten it many years of research and data gathering was required, maybe some other time on that.
As for the BFG Rugged Trail...that is one of the better tread designs out there. I suspect because most of your driving in snow is unloaded and there for your traction issue has more to do with the truck and driver than the tires.
As an aside...I don't recommend buying any tire out of China...before finalizing purchase check the country of origin stamped on the sidewall.