Watched several youtube videos and tried to pick up some tips.
The winner will be whomever's weight stays on the longest.
I can't speak for your brother's, but yours will most likely end up as part of a Mars vacation shuttle or something before that would ever happen.
Haha, you brought back a blast from the past. "Katy, a brave and untiring tractor, who pushes a bulldozer in the summer and a snowplow in the winter, makes it possible for the townspeople to do their jobs." Had to look it up as I don't remember it, but in the process of searching, I found a book written by the same author in 1939 that I had all but forgotten reading as a child. I loved to read "Mike Mulligan and His Steam Shovel". Remember that one?
Probably what uncovered or started my fondness of mechanical machinery.