(stop the truck + a few thousand more pounds of load/towed weight)
Yeah, and that's something most people don't seem to consider that often. I want my truck brakes to be able to stop the truck
and a heavy trailer, on a downhill, without fading. It's a safety issue. Trailer brakes normally handle the trailer load, but they fail (sometimes for really weird reasons - I know of one trailer that will
reliably pop a brake fuse if it's below about -10F out, and behaves perfectly the rest of the year), and you'd better be able to handle it.
At some point, if I'm doing longer distance towing with my truck, I'm going through the entire brake system and replacing parts with fairly expensive stuff for exactly that reason - and, given the longevity improvements on the cryo treated rotors and such, it should cost me less, long term, than cheaper parts.
Well, you're probably at $30/wheel for pads and $70/wheel for rotors, if you get the cheapest parts autozone carries.
Eeh. Yeah, I wouldn't go with that grade of parts on a truck that got used as a truck.
... and, if it doesn't get used as a truck, I entirely agree, sell it.