Auto OD questions

Dam if that 360 doesn't have enough power to tow in overdrive with 3.55 gears it's pretty sad. My 97 pulled a 25 ft 5th wheel with a 16 ft fibreglass boat behind it with little problem on a level road. Yes it did suck on the bigger hills I had to turn off the od but other than hilly terrain or a big wind it was always in od. Kim