You need to resize your photos so their smaller.
I'm glad your happy with doing this work, but I'd have to say on that first trailer I probably would have charged the guy to haul it off. You're basically going to have to build an entirely new trailer. Based on your photos, it looks like everything in it was junk. The only thing I've seen people do with trailers in that shape, is tear them completely down and turn them into flatbed utility trailers.
Now on the 2nd one, that looks like something you can work with. If I was you I'd convert that first one into a utility trailer and see if you can sell it for $600 or $700 and then put your money into the 2nd one.