31's on stock q's

[crawlin92]

I was thinking of buying some 31" Pro Comp M/T's for my YJ. Its sitting stock suspension right now and I have been told 31x10.5 will fit but it will be a tight sqeeze. So I was wondering about these tires... will they fit alright? I was looking into a 1.25" shackle lift if I need to but I have no idea how to install them. And how well do they last on highway? I know most M/T tires burn down and cup real fast on highway.