. >> to mark our 10th year on tv, ea wk,e ke lk ck at one of the stories we've covered. >> it's a truck that goes off-road. way f-ad this is a ston duck. it's a truck that's not afraid to get wet. >> this is, i believe, our 12th season on the boston duck tours. >> we took a special ride on the boston duck tour. it's a way to see the city from land a wern e me vehicle. the ducks were around long before this tour began. they go all the way back to world war ii. anwh ia st dk? >> a boston du is basically a world war ii amphibious landing craft that has been converted into a touring vehicle. so we take people ound the city of boston on land and then also into the charles river. these vehicles were used for a lot of different things during world war ii. and mainly they were used as a supply vehicle because they could take supplies from ships onto the mainland. >> the amphibious trucks became known as "dukws." originally designed by general motors, the duck was 31 feet long and 8 feet wide. that's over three times the size of your average s.u.v. it weighed 6h tons, even though it had no armor