I have a 07 escalade with the 6.2L 2wd and 6-speed trans. is this a reliable powertrain for towing my 23' sleekcraft from southern cali to havisu? how are the new 6-speed transmissions as far as towing reliability? anything I should know? it pulled the boat home no problems but it was only 50 miles, havisu is like 800 miles round trip for me.