For towing / hauling max boost stock ECU 16-17psi may go higher but do as mudski mentioned, raise max boost as high as possible without limp. You can set max boost with needle closed (max spool) then set spool to suit
Could spend $750 + postage (approx $790 all up) get ECU remap run max boost 20-22psi / AFR 20:1 and it will love to haul and reduced EGTs.
By the way if you do EGTs 400-500 hauling/tow, that is sooo good. I would do similar EGTs sight climbing 60-75% eng load w/tow. Depends where you are taking EGTs from also.
Recommend also to check coolant sys.
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