Yep it looks like it needs replaced to me. Did you have the manufacturer, make and model of the trailer? That should be all you need to find your parts. Call a local boat/trailer repair shop. They will be able to point you the right way.
The camper sure is looking good buddy! I'm a little concerned about the amount of weight that's on the tung though. You might have to get a load leveler. They are used on the tung to help distribute the weight so it's more on the trailer axel instead of your rear suspension. You should be able to find one at an rv shop. And I think Harbor freight has them, not sure.
Patrick