Nikson
Explorer
285/60/18 you will get no rubbing at stock height
265/65/18 (31.6") - BFG A/T's available in this size and this is what I run. You get a little bit of rubbing on the driver's side front wheel at the front of the wheel opening. The tire touches the fender liner while at maximum turn at stock height. You can simply trim back the fender liner to remove this. This is also the maximum size you can run and still be drivable if the air suspension fails and you go down to the bump stops.
275/65/18 (32") - The Duratrac and other MT tires. You will get rubbing at stock height. A lift is required. You will not be able to drive if the air suspensions goes to the bump stops.
No true MT tires in less than 32"
My understanding that stock size is right about 30 inch tire, so going up to 31 would be perfect more or less and not put too much strain on drivetrain or gearing. Going up to 32 would require some modding & will most likely effect MPGs, and other components.
Read codes for proper troubleshooting of systems. The air suspension in particular can put you on the bumpstops without warning if it sees something it doesn't like. Clearing codes can many times reset a system (suspension usually) good enough to get back to civilization. Reading live values from sensors can be extremely helpful too.
Currently, the Faultmate can enable options your car didn't come with (assuming you also install the proper hardware if required) and also update the firmware for most of the computers in the car. I believe the IIDTool has also promised this will be added later.
My Faultmate was about $1000 total (tool+software licenses). So far I have read and cleared codes (no failures, just 'playin'), updated the bluetooth module to work better with newer phones, cleared the memory on the transmission ECU so it can learn my driving style, and updated the touchscreen software to allow 'Nav-on-move entry'. Next will be a software lift and to update the body module and instrument cluster to the newest software.
The IIDTool is less money and does the suspension and codes - which is all you really need to a breakdown. It doesn't need a laptop either.
correct me if I'm wrong, but Faultmate will do everything that IIDTool does + more?!
The real benefit is I just keep it in the glove box.
1. Which is huge if you're out on the trail with no laptop or the battery has run dead. Basically you don't rely on anything. Just plug it in an do your job.
2. Since it is so easy to do a software lift, I just plug it in when I'm at the trail head - jack up the suspension. When I'm done, plug it back in and lower back to stock level. Which is super convenient.
But I would really love to get a faultmate to do the deep down diagnostics/firmware updates.
Are you not able to jack up the suspension by just pressing buttons? or that allows to raise it higher than factory allows?