So long as you are using a TS55 and are careful, the 2700mm guide rail will work breaking down 8' sheets. Of course your workflow will be far more efficient using the 3000mm rail. The solid wood and hardboard "crates" have been described.
I bought a 2700mm rail because when I was still using 2 room of my condo as a workshop, one of the rooms was small enough I could not easily walk around my existing 3000mm rail.
Also back in those days I rented space in several different shop, meaning I frequently needed to move Festools from shop to shop. The first thing I did after buying my original 3000mm rail was build a more robust transport container. I still have that container. I ripped trade 1x3 poplar to 50mm wide for the stiles running the length of the rail and beyond. The rails of the container are unripped 1x3 (about 37mm wide) and only slightly longer than the guide rail is long. the bottom of the container is made from two pieces of 1/4" Luan plywood. After the poplar stiles and rails were attached with glue and staples, I laminated a continuous piece of thin ABS to the bottom covering the splice in the Luan. That is the same kind of ABS used as the outer skin of rock & roll ATA cases. It is available in 12' long sheets. Back then I still owned a percentage in a successful entertainment case manufacturing firm.
That container is stored on a shelf in my shop, for those rare occasions we need to take the 3000mm rail to a site.