These trailers are perfect for the Smart. The largest tent trailer weighs only 340lbs.
I have posted about these trailers previously, but only one person paid any attention.
Call, ask for Blake ( He's the Pres.), tell him it's for a Smart car.
As an engineer, I can recommend these trailers.
I have a Smart now and I am going to get a cargo and a tent trailer.
If you wish, PM me with a phone # and I'll share knowledge. (I really don't like to type).