It's a spoof on the Harold and Maude XK-E Hearse, with the same practical space limitations - only short shallow coffins (dwarves and children who have been run over by steamrollers) and nowhere for undertakers to put their tall hats. As steamroller casualties are fairly rare these days, it probably only has limited use, but reassuring to know that Hearses R'Us is ready for any eventuality and can offer an express delivery service if required..