Lifespan with proper maintenance and driving techniques will depend on the actual hardness of the rubber. If you do enough investigation, you might... and that's a huge might, be able to find a durometer reading for a particular tire. However, as a general rule of thumb: highway patterns > all terrains > mud terrains. This is also a result of how load is transferred across the lugs.
I'm not sure what sort of life your aiming for, but I'm happy to get 30K out of my tires. However, that's out of mud-oriented tread designs, and for some reason my truck is ridiculously hard on tires. (<15K on Cooper ST, 18K on Toyo MT)
As a guess, you might be able to get a hair more out of a 10 ply tire, not to mention better handling characteristics under a heavy truck. I hope this helps at least a little bit.