Please take note of the different amount of steel plates in the weight box:
Callenger:
https://www.youtube.com/watch?v=ajKdTH6wAtM
Quad Trac 600:
https://www.youtube.com/watch?v=TIOPOooF088
Deere 8400 (about 7 punds):
https://www.youtube.com/watch?v=F7YrMJtV7j0
another Quad Trac (weight about 35 pounds!!!)
https://www.youtube.com/watch?v=Oc-YXxGuS68
Here you can see the dropdown of the skid (STEYR 4wd, 7 punds): The two levers at the rearend of the chassis are released by the weightbox. The edge of the skid is lowered...By doing this we have less friction at the starting line.
https://www.youtube.com/watch?v=epFTmnZ79rU
I guess we are well prpaired fpr the first championship at our expo...