I have a 2013 Colorado Tray back Auto, but 2wd. Haven't had the need for 4wd and use to have a 2006 Patrol Wagon. The ute gets me 15l/100 around town, less on the open road (around 13) Plus on the quiet days i go without the trailer and save some coin.
Much happier with an auto and towing, makes for super easy reversing, good control with hills as well. I haven't wished for the wagon back.
Only disadvantage is car payments. Hurts a bit in the quiet times, but i never have to worry about if the car is going to break down.
PS I have used it to Tow a VZ SS Commodore on a Car trailer, does it easy as.