My 2013 Black Diamond Avalanche is a 4x4 and only lacks the AutoRide feature for factory options and inclusions.
I was hesitant to buy this rig just because of the 20" wheels and was holding back because of the Black color too. In the end, the dealer did back flips to get me to sign.
I was surprised that I eventually warmed up to the color and the 20" wheels are as comparable to the 17" and 18" wheels for the ride quality on my earlier Avalanches.
Air Pressure is the key to an ideal ride comfort zone of acceptance. Too much and you'll feel every bump, too little and it may drive like a porpoise as my very old 1975 K5 Blazer with 15" Wheels did when the front shock mounts broke off after I installed Quad Shocks all the way around. What was I thinking?
Now, this is the odd thing and I doubt the 20' Wheels are responsible for this but, at 13K miles on the new Avalanche, I had a silly slow leak that turned out be some kind of sidewall damage to one tire. No one will patch anymore. I replaced that tire and at 33K miles, that new replacement tire picked up a screw in the corner of the outside tread/sidewall area. Again, no chance for a plug/patch option. I ended up replacing that tire and one of the original tires with the half life already expended.
So, hopefully, my next tire replacement will only be for the two remaining factory originals.
YMMV