Maybe in the gas coaches.
My 2000 gasser had OBD2
here is from a websitte.
" starting in 2004, OBDII began phasing into the EPA's "heavy-duty" class (8,500- to 14,000-pound GVWR). As of 2007, all vehicles sold in the U.S. in this weight class must be OBDII compliant."
I just went through this
05 Diesel pusher. Register with carb compliance website. Pay 30 bucks. get certificate. Went to AAA and got my tags. fairly easy. Carb website sucks.
Mine is an 05 so in 2025 when they start "smogging" them I will just have a visual once a year.
2011 and newer will have...