I am not a fan of red or the Yukon front end (looks like an oversized mini van to me) but the NON AFM 6.2L is hard to argue with.
As far as electronic ride control... just listen for the air compressor to turn on for a few seconds after start up. It should turn on for a few seconds then shut off. If you hear it running more frequently then there is a leak in the system somewhere, most likely the shocks. Not a deal breaker either way.
Where is the compressor located so I can focus on that area? Does it come on only at startup or will it turn on when ignition is turned to ACC?