One of the Fauvel motorgliders was mentioned earlier, with the nosecone and rudders removed or folded 90° to the side to fit on a trailer sideways. I have often thought that a powered Backstrom-style straight plank flying wing would make a great trailerable plane. The idea would be to keep the fuselage length under legal towing limit, preferably closer to about 7' 4" (2.25m) or so (more on that later). I'd use a tractor engine installation with the pilot (and passenger in a side-by-side two-seater) sitting on the wing spar to minimize CG travel, so a low wing. You'd need an engine installation which was compact in length--maybe an HKS for now, though someday an electric motor would be idealThe bane of pure flying wings is often directional stability, but it would be easy to rig up a rudder on a boom, in fact, it could be a fixed fin if you wanted to use drag rudders on the wingtips, or it could be an all-moving fin or a fixed fin and a conventional rudder. The boom could be secured by a couple of pins, plus another one for the pushrod to the rudder if needed, a two-minute job disconnect and remove or fold to one side, or the reverse. The reason for that draconian length limit of 7' 4" (2.25m) is that it would allow the aircraft to be stored in an unmodified ISO shipping container--a light single-seater in a 20' containers or two of them in a 40' container, or one two-seater in the 40' container with room for some storage at the end. All you'd need is a simple trolley, it could just be a wooden platform on wheels and some 2x4 planks nailed to the floor of the container. To go flying, you open the container doors, pull out the plane on the trolley, attach the boom and rudder, push it off the trolley, wheel the trolley back in the container, closes the doors and finish your normal pre-flight. When it's time to go home, you do it in reverse, easy-peasy. For trailer storage like a gilder, you'd wouldn't even need the trolley, just ramps for loading on a trailer that opens down one side like a Coca-Cola truck or maybe tips to the side like an eyeglasses case. What do you think? PS--Hot Wings, your folding fuselage sketch also brings to mind some interesting options for planes to fit inside an ISO container or long narrow trailer.