Sometimes 4x4 trucks can be flat towed: If you can put the transfer case in neutral. Have you looked in your owner's manual to see if that says anything about flat towing?
Look at page 711 of the owner's manual here:
http://cdn.dealereprocess.com/cdn/se.../2016-1500.pdf
(not sure if that is your model year--2016--but it does look like a 4x4 can be flat towed )