Tire carrier or not
I am sure alot of that has to do with width of tire and type of rim. My 10' Rubicon came with 32" to include the spare. They are a more aggressive tread MT but they are no wider then the ATs on the non Rubicon editions.
The key is the tire has to make pretty good contact with those rubber bumpers behind the tire. By doing that it is held securely and can't bounce around, the bouncing is what will bust it all up.


