5th Wheel Receiver Stabilizer?

At the Redwood National Rally earlier this year, we held a "Show & Tell" for people's hacks, brainstorms and other creative solutions to issues we all have. One such idea was a travel trailer tongue jack welded to some square tubing which was inserted into the rear receiver of a leveled fifth wheel. Since the auto level jacks are just behind the wheels, the rear of the trailer can be pretty springy. This guy's device slipped into the receiver and he cranked a little lift onto the hitch, effectively taking the spring out of the unit.
Has anyone seen this and might be able to aim me towards plans, drawings or even a photo so I could steal the idea and make one for myself?

Thanx,

Jim