A trailer isn't something to go "cheap" on! My big trailer is over 20 years old, started out with 3500# axles, 16' from a local builder, brakes on both axles. When I brought Dad's JD 720D home, I took it back to the builder for 6,000# axles, towing with a 3/4 ton pickup, frame is plenty heavy enough:
Two years ago, as my needs changed, I took it back to the original builder for a 2' dovetail & cut the ramp gate accordingly:
At that time, I replaced 3 of the original 2 x 8" treated floor boards ( the trailer is stored outside in all weather.
It has handled as many as five garden tractors as a 16':
My 10' was built by the same builder:
It is my understanding that many states now require brakes on all trailer axles. Don't depend on the tow vehicle to stop all loads, it may work fine in "normal" braking, but not in an emergency stop situation!