Tracks straight and steers easy does not mean it is aligned properly. That just means it is aligned evenly.
Cupping wear on (I assume) the front tires can be caused by poor alignment, poor balance, worn shocks, or lack of rotation.
Since your issue is on both the inside and outside I would suspect shocks first, or really crappy roads.
Anyway, ride height.
Front is measured by measuring the bottom corner of the steering knuckle by the ball joint to the ground (A), and then measuring the bottom of the crossmember to the ground (B), then taking B-A.
Rear is measured by measuring the top of the axle tube to the bottom of the bump stop bracket.
Front coil spring spec is 4.015 inches give or take .6
Front T-bar spring spec is 3.661 inches give or take .3
Rear specs are
RWD regular cab and SuperCab, coil spring base suspension — vehicles with more than 500 miles 178 mm (7.007 in) - 200 mm (7.874 in)
RWD regular cab and SuperCab, coil spring payload package — vehicles with more than 500 miles 198 mm (7.795 in) - 222 mm (8.740 in)
4WD, FX4 and RWD torsion bar regular cab base suspension — vehicles with more than 500 miles 175 mm (6.889 in) - 197 mm (7.755 in)
4WD, FX4 and RWD torsion bar SuperCab base suspension — vehicles with more than 500 miles 156 mm (6.14 in) - 175 mm (6.89 in)
4WD, FX4 and RWD torsion bar SuperCab payload package — vehicles with more than 500 miles 175 mm (6.889 in) - 197 mm (7.755 in)
I'll let you find your truck in that mess.