It's worth noting that light duty trucks (under 8500 GVWR) are required to meet the same standards as cars under CARB LEV II (equivalent to Federal Tier 2 Bin 5) and Federal Tier 2 Bin 8. They are allowed higher fuel consumption, though.
From 8500 to 10,000 GVWR, things get a little strange. Under Federal emissions, an automaker can either certify as a MDPV, or if it's diesel, they can certify under heavy duty diesel regulations. MDPVs have to meet the same Tier 2 Bin 8 federal requirement as cars do.
California, however, treats this class as Medium Duty vehicles. For a LEV II MDV, NMOG is looser than Tier 2 Bin 10 (LEV I roughly), CO is the pre-2008 Tier 2 Bin 10 level, NOx is Tier 2 Bin 8, and PM and HCHO are Tier 2 Bin 11 MDPV. I believe this is the same as the Federal emissions for a diesel certified as a Heavy Duty vehicle in this class, though, but a gasoline vehicle actually has to meet the STRICTER Federal emissions in this case. (It's worth noting that LEV III and Tier 3 correct this to an extent, by adding the concept of MDPVs to California's laws.)