I've got stock a suspension on my TTUE using 285/75/16 KO2 and minimal issues. A 0.3" diameter increase for the Duratracs should not be an issue except as follows
1. I have an aftermarket bumper so the clearance may vary from a factory bumper.
2. the tire does not rub the inner plastic body mount above the mud flap. An additional 0.15" should have no issues clearing.
3. the driver side has zero rub in any position.
4. on my aftermarket bumper, the passenger side has a minimal "non-threatening" rub when in hard-left on a flat surface against the steel plate protecting the water reservoir. When in hard-left and off-camber, then rub is more significant but doable. I would expect in this position, the additional 0.15" size would be a greater issue in my aftermarket bumper setup. however, the issue may be mitigated with a slight configuration and trimming of the steel plate.
5. my off-roading is mostly moderate and specific to overlanding/camping. I am not flexing the vehicle to it's limits. I avoid rock-crawling aggressive trails if possible but based on the instances where i had no choice, a lift would be highly recommended if increasing the tire size as mine did rub. I couldn't tell you where the rub occurred as I didn't get off to check, but i can tell you the sound was not pleasant.
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