Granted, those big-horns get pretty big/heavy ... But I hit a deer (Probably about 150 lbs) in my 79' at 50 mph, and there was waaaaaaaay less damage than that... (Grille-broken headlight-fender)Maybe there is an advantage to a bumper as big as mine. I'd be eating tenderized meat for dinner.
I once had a full-size bull charge my truck head-on. My only thought was "do I put it in neutral, to protect the transmission?" He stopped just short of hitting me, as the truck apparently didn't flinch.
I like the older trucks. There's a lot more steel in them.