Auto are the prefered transmission for pulling heavy loads at low speeds. Pulling a boat our of the water on a steep ramp is just one case. I love the manual but, have found it impractical for my traffic situation. I also get slightly better gas mileage with the Automatic. The only reason for a Suby manual is the fun of having or think your having more control. I've also found that the AT on average will perform faster shifting unless the MT driver is consistanly very very good and pays attention 100 % during the shifting sequence. I still love the feel of the MT but, the data goes with the AT today.