A couple of years a go, we went from Switzerland to Spain (1000 km) in this tiny car, one hobie 16 and a Laser on the trailer with 4 people in the car. Lots of waterproof bags on the trailer too and a large box on the roof.
we didn't had any Problems at all, and were still going with 90 km/h ~ 55 m/hour. (all the way down and up, going at full power :-} )
To bad I don't have picures ..