I'd suggest the Isuzu. Both the D-Max and MU-X will serve you well. Get the D-Max only if you will be taking full advantage of the bed, otherwise get the MU-X , which would give you a better ride, much more seating space, better manueverability and better access to the cargo area. With the 2nd and 3rd rows up, the MU-X would have a cargo bay that is longer than that of any 4 door compact pickup bed.

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