FREIGHTLINER CASCADIA WHIP MOUNTS
These antenna mirror mounts are made specifically for the Freightliner Cascadia trucks both GEN1 (2008 - 2017) and GEN2 (2018+). While they are designed for CB antennas, we use them for our HEAVY DUTY LED WHIPS too. You'll of course have to remove the CB antenna stud that is included with the mount to make room for the whip mount stud.
GEN2 2018+ FREIGHTLINER CASCADIA
For the GEN2 2018+ Freightliner Cascadia there are two mounting solutions (V1 and V2). The default is V1. The bracket will work on either side of the cab and has 40 degree adjustability. Made of aluminum. They're sold separately so buy 2 if you need one for each side of the cab. The second option (V2) has a driver's side and passenger's side option (not interchangeable). Sold individually or as a set. Photos below.
GEN1 2008 - 2017 FREIGHTLINER CASCADIA
For the GEN1 trucks there is one option. This mounting bracket will work on either side of the truck. The bracket has 60 degree adjustability. Made of aluminum. They're sold separately so buy 2 if you need one for each side of the cab. Photo below.