fifth wheel

Fifth-wheel hitching is a simple affair compared to trailer coupling. Choose a quality hitch and don't overburden an inadequate pickup truck with a big fifth wheel and you're almost in business.

Full fifth-wheels have become quite frequent of late, and it may not be out of place to make a few remarks on their merits as compared with half fifth-wheels. With the exception of heavy coaches and rockaways, nearly all vehicles were until lately made with half fifth-wheels; but at present we find nearly all the different kinds of work, such as landaus, clarences, coaches, landaulets, T-carts, and coupés, made with full fifth-wheels.

I felt like a fifth wheel when both of them started giggling and making out during dinner.