From what I could find out, the Dexter axle you have on your Airstream uses an inner bearing # 25580 and an outer bearing # LM67048. With that being said, the hub you will need is the Dexter # 8-201-5UC3-EZ. This will include the bearings, seal, EZ-Lube grease cap, and lug nuts.
For the left brake, you will need the Dexter Nev-R-Adjust Electric Trailer Brake # 23-458. This has a 5 bolt brake flange pattern and is for the left side of the axle. view full answer...
It looks like you have the Dexter Nev-R-Adjust Electric Trailer Brake Assembly # 23-459. This is going to be the direct right hand replacement for what you currently have. For the left hand side, you're going to need # 23-458.
The only other thing you'll need are the mounting bolts # BRKH12 and you'll be set. view full answer...
I reached out to Dexter who confirmed that your Dexter axle on your 2010 Airstream came with the Dexter Nev-R-Adjust Electric Trailer Brake Kit # 23-468-469. As your trailer is 12 years old the brakes may have been changed but the size would be the same. This will use a Dexter Trailer Hub and Drum Assembly # 84546UC3-EZ if your drums are warped or beyond their service life.
We do have the Bearing Kit # BK2-100 that will provide new bearings, races, grease seal, tang washer and cotter... view full answer...