The 30 zilla is a much better tire than the 28 zilla in many ways including side wall protection because of a much larger and rounder sidewall. They are the best all around tire i have ever owned. They will fit on your XP with aftermarket rims....
Royal does not offer the 30 inch so I would have to order these but found a good deal online. Are you sure the 30's are wider because both the 28 and 30 come in 9inch widths and 11 inch widths, I would be buying 11 inch wide for protection and stability. The problem with the 30 is I have to buy rims as you say I would need, thanks for that info.
Still not sure what to do
28 x 11 x 14 Zilla's for 121.58 free shipping
or
30 x 11 x 14 Zilla's for 124.00 free shipping but I have to buy rims...any idea what rim to get and what they cost?
Thanks again