Tj and 2 motorcycles on a car hauler behind camper.

Or just do it the right way.
Don't use a crazy long hitch extension that puts your hitch way too far behind your rear axle.
Stretch (or have stretched by a welding shop if it's not your particular skill set) your trailer tongue to reach under the camper to your hitch directly.
That's how I've done it for over ten years, pulling a 20' flatbed trailer weighing around 9500 pounds, depending what I have on it.