Is your Deere 5055e equipped with a Front End Loader?
If you are concerned with the stability of your tractor, first consider spreading the rear wheels farther apart. Then consider filling your rear tires 50% with liquid to lower the tractor's center-of-gravity.
If your Deere 5055e is 2-WD you may have very limited braking going downhill, as tractors only have brakes on the rear wheels. Going downhill tractor weight shifts to the front wheels, so rear wheels are only in light contact with the ground.
If your Deere 5055e is 4-WD, and 4-WD is engaged, you will have something resembling four wheel braking.
If your tractor is barn stored when not in use it is unlikely water will freeze in your tires. However, you may wish to add some windshield washer fluid, which contains alcohol, to the tire fill liquid to lower the freezing point two or three degrees. You know your Texas winter weather better than I.