168" is the wheelbase (so add about 31" for tires for front and rear). I put my 93 on a 16' flatbed trailer to get it home. With slightly larger than stock tires (285/75R16 I think) the tires fit with no problem....the truck's bed hung over the rear of the trailer about 3 feet (maybe a little more) so and 18' trailer should work. You won't have room to fold the ramps up though, they will have to be removed.
Jerry