I'm looking at getting a 2021 ED with air suspension. I have heard a lot of issues with this on older ED's. Has anyone had any major problems with the 2020 or later models? I currently have a 2500 with CTD and rear air suspension. No issues over 7 winters in the Rocky Mountain west. When it's super cold -10 to -20 below 0 it doesn't like to lower when button activated, but other than that no issues.