Its a 2010,5.3 in an awd savana 1500. Its struggling pulling trailer up an incline, buddy wants me to put in a 6.0 litre I suggested open up air intake and exhaust and add a tuner. So what if any power tuners actually work? Mechanic by trade but too wrapped up in repairing, never get to make anything go. Any suggestions would be appreciated. Thanks in advance.