I have had good luck with the online chat. it lets them know you are serious and the chat person will have some followup to ensure you are getting responded to.
better luck than just calling.
I opted for the z71 package on my chevy- not sure what that all entails but it has the trailer brake controller incab which leads me to believe it's a tow package. salesman told me that the z71 means it's set up to tow. I towed my old '12 tige 22ve from wisconsin to slc in may. averaged 9.5mpg's and truck pulls solid at 75mph's all day long.