Trucks that are 2007 MY and older have no DPF to worry about. 2010 and older generally have a DPF but no SCR.
Do you want to keep it under the GWVR that demands a CDL?
Freightliner M2 is popular, but I'm no fan of the CAT C7 engine. Cummins/PACCAR is preferred.
Hino 268 is under CDL GWVR, 338 requires a CDL. The Hino dealer network is not as well established, there have been a few complaints about repairs taking a long time. The engines, cab, wiring are all Hino specific, but the rest of the chassis is built from readily available USA components.
Then there are various International trucks. DT466 engines are not exactly powerful or fuel efficient, but they are reliable and parts are readily available.
Multiple Allison automatic transmissions are available for all of these.
There is no single truck that I can recommend over the others. They all have strong and weak points.