I used to DD my truck on 38" sx's...
Would I do it on iroks? Hell no, they are too soft.
Don't ya hate it when ya buy tires that suck? I did that once, never again will I buy tires for the yota without interco on the sidewall....
Sucks that you bought something you hate though, maybe someone will buy them for a decent price and you won't be out that much money in the end.
I only bought the tires because I daily drive them and they still do decent for any other tire that will last as long as an mtr. The mtr is still a great tire but going from a tire that completely rocks to a tire that doesnt do nearly as great is the worst.
Buying MT/Rs instead of the 40s is a much better decision and I dont care what people think...no one needs to talk crap though because i cant afford two sets of tires