Okay, we all realize that the Fit's not a great tug, but in case anyone's interested...
The specs look like they were for a Ridgeline, the only Honda with a tow rating as high as 5000 lb... and it has a payload of 705 kg.
For those unfamiliar with the Fit, it is basically a Civic wagon/hatch, in an economy version. Should be a great car, but not a great tug. I agree that motorcycle trailers and small teardrops would be good matches.
On the other hand, I wouldn't be so concerned by the short wheelbase (for very small trailers), as at 2450 mm (96.5") it's no worse than the Jeeps (Wrangler and similar) which some people use to tow their 13' trailers.
1979 Boler B1700RGH, pulled by 2004 Toyota Sienna LE 2WD
Information is good. Lack of information is not so good, but misinformation is much worse. Check facts, and apply common sense liberally.
STATUS: No longer active in forum.