I have a 2002 3.4 Double Cab 4x4 Tacoma. Everything is stock except for the 275/70R16 tires. I tow a 19' bass boat twice a week and my tacoma just can't handle the hills without redlining. I have done the deck plate mod, amsoil air filter and throttle body spacer. Is there anything else I can do for better towing performance? Thanks!!!!!!!!!!!!!!!!