I would go with the matching toyo's. I would bet the mil spec tires are heavier to boot. Mil Spec tires that tall are made to haul weight and take crazy abuse. That translates to heavy. I noticed no differance going from 31-10.50 at's to 35-12.50 Swampers on my trailer. In fact, pushing it around by had was easier with the 35's.
"If you don't stand behind our troops, Feel free to stand in front of them"
...There can be no divided allegiance here. Any man who says he is an American, but something else also, isn't an American at all. We have room for but one flag, the American flag... We have room for but one language here, and that is the English language... and we have room for but one sole loyalty and that is a loyalty to the American people.'
Theodore Roosevelt 1907