A Glider Kit - or "kit" as some companies call them:
Cab, hood, front suspension, frame. No engine, no rear suspension. Fully wired. Has a radiator.
Rolling glider:
cab,hood, front and rear suspension, no engine (or no transmission).
Gliders are rare today as manufacturers don't like to build them (it takes just as much work to build a glider as it does a full truck, and it takes more effort to move/transport them around).
The red and white 389 on the right is a glider kit. No engine, transmission, exhaust or rear suspension.
Tim