I would stick with the stock size turbo or a small trim T3 to keep the low end spool up and low end torque characteristics... A larger turbo will have more flow potential and be able to push more boost and make more power up top, but in a heavy vehicle thats going to be used for what your saying, the smaller turbo will suit your use better. Fit a low restriction exhaust of some kind, and turn up the pump slightly, install some GTD or 293 injectors and you will be happy with the performance I would expect. Good luck with the build and by all means post up some pictures of this beast!
Jason
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