The brake and bearings are of course part of the axle setup. You have Dexter Torflex axles. Those are common to many, many trailers. That said, you can search for an axle and trailer service firm that works on farm equipment, horse trailers, big boat trailers, anything that has electric brakes. Most will be familiar with the Dexter product but there’s not much difference from one manufacturer to the next. But your trailer will need components that fit your axle model. A lot of these shops routinely work on a lot of different types of trailers, not just RVs. I feel the frame and axle guys are somewhat more competitive and efficient than the RV people I’ve dealt with. Maybe not, just my perception. When I had the reinforcing kit welded onto my 19 Escape frame, I took it to a farm implement repair shop I figured a person who could weld on a $250,000 piece of farm equipment could handle a little job on the Escape. He prepped the metal, welded the plates on, ground the welds smooth and painted them while they were still very warm. The paint stuck way better than the original frame paint. $80. One hour in and out. Made an appointment, didn’t have to leave the trailer, didn’t even unhook. Ask around. YMMV
Iowa Dave