Who has switched from a '16+ max tow F150 to a '16+ HD F150?

Ford gives the F150 three different frames thickness and modulus numbers.

.087 thickness.....4.95 LD modulus
.100 thickness.....5.73 HD modulus
.110 thickness.....6.28 HPP modulus.

Depending on which frame one can't say just slap some heavier spring on the truck and it becomes a HDPP.

Also Fleet Ford specs show the F150 has a ...
8.80 rear axle
9.75 rear axle
9.75HD rear axle.
They don't give differences in a 9.75 and 9.75HD