Correct you are, I am really hoping that the OP will chime in soon and possibly share a picture of the carnage he is having to deal with it would have helped me to determine a more reasonable coarse of action. I have in the past had to just weld up the locations then hand grind and file then use crocus cloth to finish up the surfaces once I even had to cut new threads in one using a file and a thread chaser. while the owner of the truck held a drop light and an umbrella for me while I worked. When your sitting on the side of the road with a 15 axle rig under load out in the middle of nowhere you only have 1 option, that is to repair in place. cost or difficulty are two factors that are never entered into the equation. I've even welded broken axle shafts back together when the situation was dire enough to warrant doing so.