I used a 7 pin to 4 pin plus one adapter for reverse lighting.
There are a bunch of enclosed systems including with swing arms and such as well - most of the big names are pretty decent. I opted for the open carrier so I had more flexibility, but your needs might be different than mine.
It is very durable and strong. Sometimes I wish I had a lighter version as I don't need to put a lot of weight there, just usually bulky items. When I first got it and assembled it (back when I got it you could order it assembled/welded or the version I got where you bolt it together), I did spray undercoat on some critical areas to avoid surface rust.