I road my tractor and several other frequently.
From my place to the farm is three miles with several hills,
with just the bare tractor and front end loader (80 engine Hp) I can pull all the hills in high gear.
Drop my bucket off and install the grapple and carry the bucket at least one hill will require a down shift.
Hook up the brush hog, a trailer, or snow blower and three hills will require down shifting.
One of the places that we chopped corn on has a couple of hill that will make a 7130 IH Magnum drop a couple of gears empty by it's self,
when I have the pull type forage harvester and self unloading wagon with a load behind me two of the hill will make me downshfit from 18th gear down to 10th.
Depending on the bucket size many tractors couldn't pull steep hills with a full bucket of gravel in high gear.