Seems like there should be some thought towards using a different type of tongue on trailers that are being towed by RVs and motorhomes.
The tongues used on automobiles that are towed behind RVs allows the tongue to move up and down. Seems like that would eliminate most of the forces that are overstressing the mounting bolts on our glider trailers being towed behind vehicles that have a long distance between the rear axle and the tow ball.