the rust in the pic of towards the wheel is normal. thats the back of the hub. the pic of the rear diff, the rusty part is the axle. thats normal too. alot of the parts under the vehicle is just bare metal so a little water(rain),heat and condensation will form rust no matter where on earth you live. unless you garage your truck in a temp controlled room and never drive it.... im from michigan and i've seem alot worse. mine is worst than your guys.