Wow, way to revive a 13-year-old thread!
Anyway, yeah, I borrowed a buddy's Nashbar single-wheel trailer for a couple of camping trips. It was always a pain in the butt, and eventually I rolled it over and bent one of the attachment arms, which I then had to replace for said buddy. I got myself a Burley two-wheeled cargo trailer and never looked back (until, about 10 years later, I eventually got a Douze cargo bike -- but that's in a very different price range). The two-wheeler is a much better design. I've toured with it in the Adirondacks and used it for hauling 80+ lbs of stuff around town, and it always works fine. Get a Burley Nomad. Don't bother with the single-wheel jobs.