When I saw your first post, I thought the "glider" referred to that wing drivers put on the sleeper roof to divert air over the trailer.
OK, I'm not Mr. Pete 359, obviously
But I have NEVER heard of what you are referring to as a glider ever avaailble anywhere, at least not in my lifetime. The cabs of trucks built today are each set up to use a specific engine, most of the considerations are electrical and climate control. I don't know for sure, but I'll bet you cannot even special order a KW "glider" from Paccar. I think you have to buy a chassis equipped with at least the cab, engine, and tranny nowadays.
If other EO members know more on this subject, please post.
-Weave-