Who changes your wheels? The only time that I get the wheel nut problem is when I buy a new project car, and have to battle to get wheels off that have been bolted up by a chimp with the windy gun turned up to 11. The torque is something like 94 ft pounds - stick to this and you'll be fine. I put the bolts back on with the windy gun at its lowest setting (about 70 ft pounds), then go to 94 with a torque wrench. It adds about 2 minutes every time I take a wheel off, but saves time in the long run.
Bottom pulleys do disintegtrate, it is the rubber damper section in the middle. Did it disintegrate after 18 months from new, or just 18 months of ownership?
Rear suspension - the long bolt in the bottom of the hub does seize, solution is brutality and a new one. Cover the new one in waterproof grease before fitting.
Front suspension - the only really bad bit is the pinch bolt on the bottom of the shocks - any garage will have a press to take this out.