We used to have a small(ish) Jayco that the previous owner lengthened the tongue. This supported a "deck" that was very nice for bikes, a generator and alot of other stuff...I think a golf cart could have fit.
The tongue was a steel tube welded into the original hitch tube after they had cut-off the original hitch. The tube was supported by cross bars made of steel flat stock welded from the tube back to the front frame under the trailer box.
The main tube and cross stock carried the deck that had a sort fence on 3 sides. The 4th side fence (passenger side) was pinned so it could be removed and used as a ramp for motorcycles/bikes.
This set-up put most all the weigh on the tow hitch because there was no extension to the back end of the trailer for counter weight, but I was towing with a 3/4 ton truck and had no issues...the mfgt gross weights were obviously void.
The picture of the Jayco (above) is almost exactly what it looked like, except for the off-road tires/wheels.
If you do this, good welding skills are a must.
Best of luck.
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
WE LOVE OUR OUTLAW RV