4X4. Got caught in deep gravel and tires of trailer on one side went to rim edge. Put it in 4 low and it pretty well idled out of the gravel. I am also in a snow belt area and two wheels just spin unless I load back end down with weight. Put it in 4 hi and I am solid on the road without the extra weight. Bit more costly and reduces cargo capacity of truck but worth it IMHO.
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