If you think you need a 6'x12' go bigger!
I am looking at Gator made and PJ trailers.
1500 will get you a new 6x12. I think that's the route I'm going.
I bought a PJ 83" x 14' single axle, and now wish I would have gone for the heavier duty 2 axle.
I highly recommend the PJ trailers.
I really like the construction, and the hitch that they use is especially good.