10.5 inch tires on the front 12.5 on the back.
For the purposes of skinnys in the front for better clearance fattys I. The back for added traction.
I'm afraid it's going to look dumb.

 

If you have A 4x4 I think you should run the same size tires all around.

 

a 33 10.5 and a 33 12.5 is the same size...
being wider wont mess anything up....

 

honestly, nobody would know the difference but you.

just be sure the tire specs are actually @ 33" tall for either width of tire. Many tire manufacturers spec their tires to a certain size, but they are up to 0.5" off at times.



the only important part is they have the same 33" diameter...I say go for it. can only help prevent rubbing IMO