The Chimera has long served as the proud default APC of the Imperial Guard.
Apparently, the "common Desoleum groundcar" is a much safer bet. The infantry would love to get their hands on some of these!
Armour is better by double on every single facing, it's easier to repair (due to the Rugged trait), they're easier to buy (-30 instead of -80), and it controls better! The only drawbacks are a smaller passenger capacity, a slightly slower speed, and a lack of mounted weaponry.
I'm sure the Guardsmen would make the switch, and cut their own weapon ports.
This is just silly, folks.