I get irritated easily with stuff like that, especially when this has nothing to do with this given post. I understand having a hard time but there are things that can be blamed on the truck and things that cant. The brake lines, ok yeah ill give you that, faulty manufacturing no ifs ands or butts, that is settled. For the steering, yeah that's cause by wreck less driving, cant tell you much than that but from my experiences with working in different garages, truck owners beat the living hell out of their truck, the ones that don't care will fix only what is needed to sell it, and depending on the dealer will depend on the quality of the vehicle check.
Good example of that is most buy here pay here's, they do horrible checks so issues like what your dealing with can pass through very easily. Bigger dealerships tend to do better jobs and in the very least makes a notice on things the owner can take care of such things, though they still mainly stick to safety and drivability. But that will still depend on the seller if they mention it or not even if it is marked ''as is'' its still a crap shoot.
No matter how you slice it, the vehicle can only be blamed for so much, the previous owner(s) are responsible for the rest but its the current owners job to either set it right or pass it along to someone else and give them the heads up on issues so they know what they are up against while you move on to another vehicle.
BTW my truck is lifted with oversize tires and is no stranger to off road use while still being a daily driver. The main issues I have is alignment, a short somewhere in my reverse light circuit and since my a/c if vacuum controlled I loose my vents at highway speeds. As for worn out parts, just wear and tear.