Re; Brakes
Thusfar {30,000 Miles} We've had our SMB out on several trips throughout Oh, Mi, Wi, Mn, Il, In, Ky, Tn, SC, Ga, Fl, Al, Ms, La, Tx, NM, Az, Ok, and Ar.
Most miles, {70%}, towing our travel trailer, {GCW 19,500 Lb.}.
OEM brakes along with engine braking has been adequate for our needs.
Most recent inspection revealed no problems associated with brake overheating.
As with many other things, We might consider an upgrade when repair/replacement becomes necessary.
Really don't relish the idea of making changes just for the sake of change.
We also find the 245/75R16 Tires adequate but will probably upgrade to load range "F" when these are ready for replacement.
Also see my post in Towing and Toys.