Ford 4x4 F series through 2012, with auto and shift on the fly are NOT towable 4 down. GM 4x4 with auto and electronic transfer case are towable 4 down. Dodge 4x4 is mostly towable 4 down, but check as they have some that are not. This is also true with most of the manual transmissions in the trucks. We like the GM products as they are very easy to set up and configure for 4 down. Also all GM trucks since about 2003 do not have a steering lock, so you lock the door and put the key in your pocket. Most of your late model(2000 & newer) DP's will tow any truck you want.