Thank you for the pictures!
To fit your 4400lb Lippert axles you will need Electric Trailer Brake Kit - Self-Adjusting - 12" - Left and Right Hand Assemblies - 5.2K to 7K # AKEBRK-7-SA which will replace the Lippert 122259 brake assemblies you have.
To verify which hub and drum assembly is correct for your trailer you will need to remove your hub and drum assembly and check the outer bearing numbers. If your bearings are worn to where you can't read the numbers, you will need to measure... view full answer...
If the unloaded tongue weight of your 2015 Evergreen Ascend trailer is around 300 pounds, I don't think the Reese Pro Round Bar Weight Distribution # RE44FR is going to be the best option for you. This will have a minimum tongue weight rating of 600 pounds, which sounds like you would need to load the front of your trailer very heavy to get to.
With that said, it sounds like the better option will be the Reese Pro Round Bar Weight Distribution # RE34FR. This will have a tongue weight range... view full answer...
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