Don't know too much about the XML's but I have seen the XZL's, they have a hard compound and stiff sidewalls, they are a tuff tire but they don't flex that well. I would say they are similar traction wise to a BFG MT, maybe a little less from what I have seen, but due to the stiff sidewalls the slip on rock a bit, and they don't have much in the way of sidewall lugs to help. I think they are ideal for vehicals going over ruff teraine carrying heavy loads, like going on safari or something.
Don't forget to
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first then ask questions later! The loose nut behind the wheel