Truck Debates - Why does it seem to be mostly Ford vs. Ram?

With Ford being the top-dog and a big target, it's easy to see why folks pick on Ford. However, Chevy/GMC sales are a relatively close 2nd. Ram sales are 3rd. Even so, after months of reading threads here, and in other forums, I get the impression that Chevy/GMC trucks tend not to get caught up in these Big 3 truck debates nearly as much as Ford and Ram.

True? Or, is my impression skewed.