have cherokee2000 sport 4dr. bottom of doors are starting to rust out. i took it to a body and fender place, and he said that if he fixed it it would only come back again. he said it happens from the snow and salts on the road. if they can't be repaired is there something i can do, like maybe try to find other doors, any help would be appreciated. the rest of the vehicle is in very good shape and runs well, that's why i want to keep it...thank you