There are probably a half dozen manufacturers and about 10,000 different brands. Do a little internet research and you will see that A, B, C, D, E, F, G and H are all made by "123".
As someone else said, how the owners have maintained the rig will have a lot to do with how good the trailer is.
Our first was made with wood studs and built really solid.
It was too heavy for us and we traded in for one with aluminum studs (not built quite as well). We have had zero serious issues with the lesser quality construction.
