OK,bike trailers.Knew nothing about em so did some googling.

Apparently Burley is one of the better and they are all over craigslist for 1/2 to 1/3rd of new retail,an example...Apparently the 2 kid version is good for 100 lbs but I saw an ad where a 230 lb guy says his can support his weight.
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Burley D'Lite bike trailer - $200 (Tustin)
Date: 2012-08-13, 4:19PM PDT

Burley D'Lite bicycle trailer.

Holds 2 kids. Gently used.

Includes jogging attachments - extra wheel and push bar.

Retail over $400

For quick sale at less than half of retail.