Yes the tow/ haul function is safe to use. I wouldn't tow with it on level 2 or 3 on the EZ. Keep it on level 1. The stock injectors on 3rd Gens don't like a lot of added pressure. Also having a set of gauges would add some safety as you could keep an eye on the EGT's and Tranny Temp.
:ditto: Don't run higher than 1 when towing that much. empty crank it up! but as far as the injectors i have had no trouble with mine and I have the Juice, EZ, and Bully Dog for my truck with no problems
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