I have an 11.5 on a pickup. It needs a four-foot extension. I choose to stretch my trailer tongue because the physics are so much better.
Lots of people say if you do that you'll hit the camper on a steep angle, but you'll bottom out on the ground in the same place with an extended hitch. Neither is well suited for extreme off-roarding but in many thousands of miles I've never had a problem like that.
With only a one-foot trailer tongue stretch needed to clear your camper I think it would take a pretty extreme angle before you had a clearance problem.
Another benefit of stretching your trailer tongue instead of using a hitch extension is it makes one less thing you have to do every time you load or unload your camper.