n.b.tetter totter effect.
no ballast on rear = front tires. will end up seeing more weight being placed on them.
when there is more weight on rear. the "fulcrum point" changes. below the tetter totter errr on the tractor. further back towards rear wheels. other words. if you added a huge amount of weight on rear end of tractor. the tractor would end up doing a "wheelie" were front tires come off the ground. *been there done that* disc, and bush hog i have for the old allis chalmers tractor. will get front end to want to easily come off the ground.
your "MANUAL" for tractor / FEL should state approx how much weight to add to rear of tractor. when doing FEL work. so the correct ratio of weight on front tires and rear tires is placed. and help prevent flipping tractor backwards doing a wheelie. or prevent doing a front wheelie.
I may not be the first person to tell you this but proper punctuation (including the use of commas and periods when appropriate) *may* help you get your points across much more effectively. Reading and comprehending the two paragraphs above is somewhat tedious.
Wrooster