Just my thought on the DEF issues. Maybe some guys let their rigs sit to long because not using with Covid issues. Might have caused DEF to go bad?? I drained all mine out and replaced with fresh. Just did a 6000 mile trip. Never let fuel get below 1/2 tank and refilled DEF with every fuel fill up. Didn't have any issues. Very thankful 2020 Anthem started out with...