What are my options for a well built rear bumper? Pics and prices would be nice! Also, I am currently running 285's on 17in fj's, spacer front and LC 9 wrap coils. I want to possibly go down to 265's on a 16in wheel or 15in wheel to get back in the power band of the 4.10 gears. If I go to the LC 7 wrap coils will I be ok, I do have a little nose down with the 9's. Thanks!