Stuffing tires like that is totally pointless. First of all bullshit that he doesnt rub much, I can rub my 315s wuth 10" of lift so he cant even start to say his dont rub much. They are on stock rims, but still. All those 36s are going to do for him is
1) wear out his IFS faster
2) tear the crap out of his fenders if he flexes it out at all
3) make his truck SLOW, you really need to regear for 36s
In your case with a bodylift I would get some 33s, you wont rub nearly as bad, and wont need to regear.