I wonder as well. Here's a side by side comparison on tiresize.com. Also, don't discount the 285/60/20 unless you don't want to sacrifice the height. But for me, I don't want it looking to tall without any width. Also, good point about the spare.
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A lot of those tires are measured on 8" or 8.5" rims (my QX56 OE has 275/60-20 on 8" wide rims). Each 1/2" in rim width adds about 0.2" in section width and a slight reduction in diameter. The Ram has 20x9" rims. On the 20x9 rim, the 275/65-20 in probably around 11.4" wide, the 285/60 about 11.7", and 295/60 about 12.0". All should fit without a problem although I'd like to hear reports of full lock. There are some 35" with ORG and no lift kit. I'm wondering if those don't hit the fender at full bump; with a 2" level they should be fine vertically.
And a 3.92 on a 32" tire becomes a 3.58 equivalent on a 35" tire, a 3.68 equivalent on a 34" tire, and a 3.79 equivalent on a 33" tire. The 35" tire and maybe the 34" tire might have had lower GCWR ratings on the SAE J2807.
The first question: is it about show or is it about go...or a little of both. And is the go a heavy payload, a heavy trailer, or lots of backroads?