I believe I've come up with a way to kill the gap for highway travel, and provide enough tongue for turns in town. Leave the tongue unattached to the trailer box frame, but run it through a sleeve that
IS attached to the trailer, so that the trailer proper with it's axle, can slide forward and backward on the tongue. Do this with a reversible winch
(
https://www.lowes.com/pd/Trakker-1-H...Winch/50332867 ) controlled with one on two push buttons inside the car, (one to draw the trailer box frame forward, and the other to draw it rearward.). When on the highway, where turns are gentle, push the "F" button to pull the frame box and carrier up to the rear of the car. Winch locks in either direction. Coming up on an exit? push the "R" button to extend the trailer to provide clearance for in-town turns.