well, let me rephrase that then, if the frame doesnt get messed up by a pliw, the front end will. plows are hell on suspension components. a front end of a normal truck just isnt designed to hold that much weight on them. if it is a super duty, it will hold up longer. the comboned weight from the rig, plow, plow frame coupled with all the sudden jolts and bangs accosiated with plowing eventually takes it toll. All that combined with the salt that is spread everywhere will kill a truck.
and on another note, i still dont see how a deer can hit a truck so hard that it will cause it to turn or veer off the road. that driver must have spazzed out..it just isnt possible, even in icy conditions..200 lb deer vs 8000-12000 lb truck....aint gonna happen