20' Container Slider Chassis

I don't recall ever seeing a container chassis in N scale that is suitable for hauling 20' containers.  Well, I decided to change that tonight.  Here is a 23.5' chassis with a sliding bogie.  I may design a fixed bogie just to have a couple different versions.  The wheels and slider are separate pieces, so it can be assembled in the extended or non-extended position.  I rendered one of each to illustrate what it would look like.