I live in SoCal so obviously I don't have these rust issues, but my stepdad owns a 4 wheel drive shop and has an older lifted Suburban. King sponsored him when he built the Dana 60 into the front, and it was in magazines, etc, but I noticed rust on the frame under the doors.. I asked him why he didn't fix it (This is years after it was in the magazine, now it just sits in his driveway) and he said "I'll be long dead before any rust is going to eat through that frame".. Maybe a different story for people in more rusty areas.. Still, I would be pissed if my brand new truck was rusting already.. I know you shouldn't have to, but can you paint the frame where it's rusting?