Much of my braking on grades is handled by my tow-haul transmission mode. Your Allison trans could be equally Impressive. I use the best over the counter brakes on hand although this is the first year I will be trying ceramic pads.
I pull my brakes apart each year to inspect because I’ve had brake problems on the road before and the maintenance seems to help-but that may just be me and/or my particular truck.
Don’t forget to check out your tires too-they are part of the stopping package and older tires that are carrying more weight might not take the strain and heat of a steep grade very well.
Overall I think you will enjoy those 1-ton brakes over your smaller trucks, especially when towing less then 10K.