I bought a very nicely built new 5x8 foot trailer from a local builder in the area for $550.00.

Lights, fenders, tilt bed, treated wood flooring, single torsion beam axle... Recommend a 5x8 versus 4x8 foot as the cost difference is very little and the extra room makes it much easier to load 4x8 foot materials..

I've built one myself once before and having done it, it was cheaper to buy the one above than scrounge all the parts..

The torsion beam axle lets the trailer sit lower than one built using leaf springs.. This would make it easier to load stuff like bikes...