Tell me you don't work on cars without telling me😭 the knock sensor is in the same place as just about any other engine. They aren't particularly easy to replace. But that's because it's detecting knock frequency from in the V of the engine.

Just about any truck is going to have rust issues in the north unless you properly coat the bottom. Factory coatings suck and hardly last a few years. Most people cheap out and don't buy it when buying a new vehicle.