There are several products available to clean and preserve exterior plastic trim. A good choice would be 303 Aerospace Protectant or Meguiar's Gold Class Trim Detailer. Mother's Back to Black also works, but doesn't last as long as the others.
The Xterra is body code WD22, whereas the Frontier is D22.
More postitive backspacing moves the rim's centerline outwards, making for a larger track - which increases the truck's stability. The stock rims are 5.25" whereas with body lifts, 3.75" is recommended.
It is not absolutely required, but a very good idea - especially on 3" body lifts. Lifting raises the truck's center of gravity, and increasing the truck's track compensates for it.
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