Agree with 1 inch is the best for 285s. IMO 1.25 is best for 275s. I'm running slee spidertrax 1.25s with 285 tires with 2" lift. Love the look and that's the only reason for me.
Recently, someone posted a bora wheel adapter failure on a facebook page. Said lugnuts on adapter loosened on a rear wheel and totaled their LC100 on freeway, of cause with photos of the truck but not much on the failed components. That's good example of a failure, a catastrophic failure, even can be deadly. Which probably caused by a negligence of the installer or tech did a repair on that wheel/tire. Yes, its another thing can fail, huge safety issue, also can easily missed when buttoning things up because those lugnuts are hidden under the tire. Its hard to catch compared to, unenlightened wheel lug nuts, or forgetting to put coolant after coolant system repair, or no oil in the engine after a oil change. Yes, these silly mistakes happened and happens at dealerships as well as at trusted mechanics.
Because of these reasons, I take care of tire rotations, and DIY maintenance. I verify lugnuts of adapters on every time I pull a tire. Most importantly, I'll make sure those are tight in case someone touches those. These are the important things to consider and inconveniences of having adapters. I will never use adapter if I trust and depend on dealerships or other shops to do tire rotations, maint, etc.
Here is mine next to a non lifted twin with 285s, twin has ugly fender flares though. Hope this helps to make your decision...
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