No photo handy, but here is a link to a review of the trailer I'm using: Burley Bike Trailers- Living Up To Their Name? | Cycling-Review.com (we have the D'Lite, the first trailer shown in the review)

Obviously this trailer is not primarily intended for cargo - it's designed for one or two kids in the front with a small cargo area in the rear.

We were leery of buying this because it was a bit spendy - but we've definitely gotten our money's worth out of it. Now on our second set of tires, which are just about worn through and about to need our third set of tires.

The kids are just about grown out of this - now mostly on tagalongs or on their own bikes - but we still use the Burley for cargo/groceries/commuting.

As locolobo alluded, the big drawback of this setup is that it does give you a wider footprint than a single wheel trailer would.