I think it is better and more stable, plus cheaper and easier to extend the trailer tongue than to extend the hitch. You can either get a trailer with a longer A-frame, have your existing A-frame extended, or have a removable extender built.
Then the center of gravity does not move rearward, like when you extend the hitch.
Here is the removable extender I built for my 27' open trailer:
Here is my 28' race car trailer that I had the A-frame permanently extended on, hooked up behind my old Lance.
On the Lance I put 2x6 lumber under the camper to gain clearance, plus I had to remove the rear jacks to clear the A-frame on tight turns. I stored them behind the seat in the cab. This help move the center of gravity forward. On the Real Lite that I used to have and the Arctic Fox 1050 that I have now, the rear overhang doesn't drop down so much as the lance, so All I had to do for clearance was raise the jacks a bit.
Here is the open trailer with the extender behind the Arctic Fox