The goofy thing with trailers is they seem to hold their value at a certain point. I bought one of those Chinese-made trailers - used. 4x6 w/ plywood floors and plank sides for $250. It did everything I asked of it. I'd have to say it paid for itself many times over when I figure delivery fees for landscaping materials etc. After almost 10 years of trouble free service my trailering needs grew so I bought a 5x10. I sold the little 4x6 for $200 to the second person inquiring. The others are correct, it will cost you some to build that trailer frame into something you need. And you might want to check with Craigslist for some better values.