Yes, this. I believe it is an all metal part 12 foot long and indeed it came to its current owner on a 2x4.
Originally Posted by
OzarksGma
If this is the newer metal track, I would attach it to a 2x4x12' and then you can put it on the top of your van with out worrying about it flexing out of shape. You may want to use an individual 2x4 for each piece and secure it to the top of your van.