Welcome from Texas.
Generally, most people use 500 miles as a break in period for a new engine. Me personally, I don't baby my cars. I drve them exactly the way I will from the very first time I drive it off the lot. So if it were me... I wouldn't be scared to tow something off the lot.
Here's a couple of links for running boards...
http://www.runningboardwarehouse.com/durango-2011-2012.aspx
http://www.autoanything.com/nerf-bars/77A3795A3773760.aspx
Not sure about the luggage rack.
Hope this helps.
Generally, most people use 500 miles as a break in period for a new engine. Me personally, I don't baby my cars. I drve them exactly the way I will from the very first time I drive it off the lot. So if it were me... I wouldn't be scared to tow something off the lot.
Here's a couple of links for running boards...
http://www.runningboardwarehouse.com/durango-2011-2012.aspx
http://www.autoanything.com/nerf-bars/77A3795A3773760.aspx
Not sure about the luggage rack.
Hope this helps.