Brake Wear

"I put new drums and pads on..." Do you mean rotors? Pads and rotors go together and drums and shoes go together.
"and said they are cammed over May 2024." How do disc brakes get cammed over as s-cam applies to drum brakes?
Brakes may be dragging due to issue with calipers, hardware, sticking quick release valve. I would jack up the front, apply and release brakes, and see if the wheels spin freely.

 

Bobtail proportioning valve bad?

 

Engine brakes much?

Sounds like he’s just overdriving the truck.

Check air pressure to drives? Are the rears wearing at even close to the same rate?

 

Does the truck have Q-Plus brakes?
If they installed regular shoes, they could wear faster then cam over.

 

Years ago I had a slack adjuster changed during my annual safety inspection. I drove roughly 1000 miles going through a city I got cut off badly and did a hard braking 30 minutes later I stopped for fuel and the wheel was smoking . Turns out the adjuster they used wasn’t compatible with the slack and would tighten if you braked hard.. something to do with new style and old style .

 

Years ago I worked at a fleet of 9370's and 3 similar 4300's were transferred in. They were steer axle brake eating monsters.
Learned that there is a brake porporting valve for steer axles. I thank 3 different ones with different air ratios.
They work something like this. At 30 PSI brake application it only allows 10 to the steer. At 90 PSI application they allow 50 to the steer. At a 120 application everything is at 120. Those trucks did not have a porportioning valve on the steer axle.
I am sure someone will come and kick my stool out from under me for incorrectness but I am just sharing the basic idea. Check your steer axle valve.