Yes, it was us -dad and Adam.
The contest was back in 2007. Scoring was based on the ratio of the weight carried to the weight of the vehicle. Plus the time factored into it somehow. The vehicle had to carry the weight for one meter. We used a bar bell with weight plates for the weight.
Here's the winning entry's statistics:
Weight of vehicle: 1.78 lbs (.81 kg)
Weight carried: 78.1 lbs (35.4 kg)
Time: 27 seconds.
Here's a picture of the vehicle. A video was never posted. I still have the video. It's about 1 minute long and 117 mb. I don't have a youtube account. Let me know if anyone (with a youtube account) would be interested in posting it for me. -I didn't want to create an account for a single video (too many accounts to keep track of already). I could condense the size down if needed.