If you log into the Thor website and setup an account with your units VIN number all of the Manual s of what is in your unit will be listed mine had one for the air conditioning system it seems to be an after-market one they do have a manual for it keep in mind I have a 2017 Axis. I hope this helps you out.
Rev. Jeffrey 2017 Thor Axis 24.1 E450 Windjammer.
Silver Safe-T-Plus Steering Control
SSF-106-40 SumoSprings Solo Front Bump Stop SSR-107-47 SumoSprings Rear Bump Stop
Hellwig 7718 Front Sway Bar & 7180 Rear Sway Bar
Koni FSD Front Shocks 8805-1042 / Koni FSD Rear Shocks 8805-1043