Why split rear seats?
1. I agree with previous post regarding swappability using Suburban parts. It is a cost saving measure. Remember, the AV is based on the Suburban frame that's why it rides like one as opposed to a pickuptruck--a smoothness we have all come to love and enjoy as opposed to the usual bone jarring rides we have associated with trucks.
2. Permutations/Combinations: With a 60/40 split, there are more combinations of cargo carrying capacity GM can boast the AV can do--which lends itself to the AV"s "transformers" image. Besides, imagine if it was a 100% bench. We would have dozen of posts here that would state:
"Why didn't GM make the rear seat a 60/40 split?"
3. This is how I do it: coming in from the Driver's side, lean inside and fold the 40% first, then fold the 60% last. You can also do it the other way around but once the 60% is folded, it much harder to lean in to reach the other side. Or you can do it the traditional way like they show in commercials where you go around the truck to do the other side. If you have a small garage that may be a problem though. I don't mind doing it this way because I get I chance to look at my baby's huge *ss.
Baby got back you know.