1 Year Plus Experience with Tires and wheels here (work at a tire shop)...   Last night actually, My buddy just got done welding some beadlocks on to his 10" wheels with 2" backspacing. ( reverse MOunt wheel)  IT not happening. We tried every machine, tire IRon and we could not get them on there.  Reason being...  You can't get the top bead over the rim. You can put a tire on there from the back side of the wheel and air it up like normal. But if you think your going to get that top bead of the tire over the top for beadlocks on a reverse mount rim. Think again. 

So in conclusion, If you have a reverse mount wheel, and beadlocks, Chances are you are not going to get the tire over the top of the rim.

And we were trying this with 35 14.50 15 boggers.

You might be able to get a 15x12 wheel with 2in backspacing. Be cause there, you might be wide enough so that it is not a reverse mount wheel.