As of August 2015, reviews of good carry-on 5x8 utility trailers are online at Lowe's and Tractor Supply Company. Each site has users comments and ratings based on five-star scales.
Lowe's and TSC have reviews of a carry-on mesh utility trailers with a gate. The model averages over four stars at both sites. Reviewers state that it is reasonably priced and sturdy. It moves smoothly even without a truck pulling it. Many people report attaching plywood to the mesh trailer bottom.
Lowe's also has reviews of a carry-on 5x8 utility trailer with ramp gate. It has an average rating of 3.6 stars. Positive comments say that it tows well, is easy to load, and hauls many types of cargo.