The factory did make a change in the Dexter axels starting around 2007. The previous axle had a down angle of 22 degrees. The newer axels had a down angle of 45 degrees. Thus most 2007 models, and all models afterward do not need the 2.5 inch lift kit.
This thread has the information:
https://www.trailmanorowners.com/for...light=lift+kit
Dick