[dpam]

I have a Reese 16K round tube slider that I had in our 2008 GMC 2500HD regular box (6 ft) and because of the front nose of the 2010 Montana I never used it. I now have a 2011 GMC 3500 HD regular box (6 ft) and never had to use the slider because of the nose of the 2010 Montana. To be safe I feel it is still a good idea to get a round tube slider. I had a rectangular flat slider in the past and in my opinion it was useless because it would not slide, which is why I bought a round tube slider.

All the best.