Help me out here what exactly is TFS? What's the american name?
Of all the Isuzus out there I don't know of any of them that can't have 33" put under them with about a 3" suspension lift, unless we are talking about some of the newer rodeos 98 and up require a bit more trimming and a possible body lift to clear 33's.
But let us know what you have and someone will tell you what has to be done to clear 33's.
Joe