For the longest time I have been toying with a roof rack design but decided not to do it for now. Basically it is a roof rack with the spare and jerry cans on top by the back. For in town driving it stays up top. For off road and off-camber angles it slides back and down to latch onto the back bumper (custom). You would need some heavy duty sliders - maybe Uni-strut and rollers. If I get bored I might still do this.