There is a difference between the small John Deere bulldozer and a Cat D-4 too. One was for the Wokka....the other for the Sky Crane. Guess which one we took out of the baseball field by mistake? The B Model Wokka was strong...but gosh.....those Cats are made out of real steel!
To cap it off....we were accused of stealing the dozer. The Engineering unit that got the Cat instead of the John Deere swore they never seen it! Blind buggers in that they were on a mountain top LZ hardly bigger than the Dozer when it got there.