First off, there is no down pressure on the 3pt hitch. Even if there was it would not be desirable, as pushing down on the 3pt implement removes weight from the rear wheels and reduces traction. All you'd do is spin!
A 100HP tractor is capable of pulling much more than a 10ft disk. We used to pull a 16ft disk with a 16ft spring tooth harrow behind it using a 100HP 856 to fit up fields for planting.
The choice of disk is dependent on what you want to do. An offset disk is for primary tillage, that is, tearing ground after harvest, or for the first time in the spring. A tandem disk is meant for breaking of clods of soil in freshly plowed ground.
Transport disk is any disk with wheels.
Disks that are wider than 16ft generally have folding gangs to make them narrow enough to transport down most roads.
3pt disks are usually 8ft or narrower, and are meant for use on smaller tractors in smaller fields where maneuverability is important.
Any disk will be a combination of at least two of these "types" above. Offset transport disk with folding gangs, for example. 3pt tandem disk, for example.
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