I have a truck that has 300k miles on the original engine and transmission but I have to change the headlight switch every 50 to 70k miles. I also have to repl

I have a truck that has 300k miles on the original engine and transmission but I have to change the headlight switch every 50 to 70k miles. I also have to replace the interior door handles every 100k. So, 6 door handles (right and left), 6 light switches, a fuel pump, radiator, and she's ready for a suspension. But rocking the same engine.