2wd's have a higher tow rating than a 4wd. No need for a locker around here. Proper driving techniques should alleviate wheel spin. You can have one added for a few hundred or less. More if you want a fancy locker, that is really not needed. The right rear end gear ratio will be important. Again that can be changed fairly inexpensively, but the PCM will need to be reflashed. The downfall to the Yukon vs the Yukon XL is the short wheelbase. Bigger IS better.
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