I agree with Treswright3 that cheap trailers are a false savings. I own two trailers, a no-name 5x9 utility trailer and a drift boat trailer by Baker Trailers.
Over 10 years I have done zero maintenance on the Baker Trailer.
The utility trailer however has needed...
1. New wheel bearings, both sides.
2. Repainting once due to extensive rust.
3. New 2x6 wood floor since the non-treated raw pine rotted out.
4. New lights and wiring harness, original one was just stapled to the underside and road gravel cut it to pieces. Lights NEVER worked well, poor ground.
5. Weld repair when the tongue fell out! (bad welds, broken low grade bolt)
In hind sight I would be several hundred dollars ahead if I had purchased a better utility trailer from the get go. Not including the hassle of road side break downs and overall reliability. That tongue fell out during a trip, fortunately I wasn't on the highway at the time.