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Mine are 33's, 285/75/16, I simply pulled apart the original Obieco carriers and used the center handle/bolt assembly and added a 5mm round plate to fit the center of the wheel. The plate hole had to be offset from center because of the extra height from the original 7.50 R16's (31's), 2 inches overall but 1 inch at the center of the wheel.
To use 35's the grab rail above the tyres would have to go (easy) but the trick would be lining up the center bolt/pin that holds the wheel on, it would now be another inch offset. A plate with 2 wheel studs fitted would be ideal or perhaps the mounting points inside lifted to the right height.
On mine I also added 2 brackets (from the original ladder racks) to the mounting points so that I could also put straps on for that extra peace of mind, after all the whole assembly is held together by the quality of the weld between the bolt and the handle (if the handle snaps off the whole lot falls on the road). It all worked well, 1600 klm's of corrugations to the tip and back and they didn't budge at all. Of course I use R pins (tow bar tongue hitch pins) on the inside of the canopy to prevent theft.