Yah, I had the same thing come up pulling a little SxS 6x12 open trailer.
I have a 24" extender/stinger but the catch is as you go out in length, the less ball weight it can carry.
Ex:
I have a Flatbed on the Truck Cab Chassis. Camper on that required a 24" extender. Tongue weight at the flat bed was reported at 700lbs (not sure if that is correct) so with a 24" stinger it's cut in half to apx 350 lbs tongue weight. (I think that is too much but?? I was less so didn't worry about it)
The point being that the further out you go, the less tongue weight which is obvious, just think of hitting a bump and think about the swing up and down.
There is a formula for calculating the amount from the original hitch to the the extender.
Other option is as noted above, call torklift for a Super hitch depending upon your towable.. or a local shop that can do the calculations..
Hope that helps..