No mattress in ours either, but in the late 60's, a few of us asked a lanscape gardener mate to take us to Nottingham Goose Fair in the back of his Moggie 1000 van PROVIDING he cleared it out of tools, plants, cuttings and the like.
When he arrived to pick us up, he proudly threw back the doors to reveal ........................a freshly laid turf lawn, carefully cut and fitted to the wall, all for our ever-lasting comfort and travelling pleasure.