car trailers

Check the laws in your State as far as brakes
I believe it is based on what weight you have the trailer registered as whether it is required to have brakes or not.

Sorry forgot about springs. Some trailers have what they call tortion axels. Spelled wrong. The are found on stock trailers. This means no need for springs you can run with wheels on dual axel trailer is you have a flat and you can be fully loaded. If you can post a picture will help.