One metro, two rule books
The state line runs through the middle of this metropolitan area, and a great many people live on one side and work on the other.
That matters because vehicle requirements follow the registration address rather than the car. Missouri requires a periodic safety inspection for most vehicles and tests emissions in the St. Louis area. Kansas requires neither a periodic safety inspection nor emissions testing.
So two identical cars parked either side of State Line Road face completely different obligations, and moving across it changes what you owe without changing anything about the vehicle.
Hail, at the northern edge of the alley
Kansas City sits at the top of the region that gets the most damaging hail in the country, and most springs bring at least one storm worth noticing.
The dents get claimed. What does not get inspected is anything clear and anything thin.
Lamp lenses. Hail cracks polycarbonate without shattering it, sometimes finely enough that nobody sees it in a car park. Water gets in, the reflector corrodes, the connector oxidises, and the unit fails properly weeks later when nobody connects it to the storm.
Condenser and radiator fins. The thinnest aluminium on the car, at the very front, unprotected from above. Flattened fins reduce the surface available to reject heat, and a car that cooled fine before a storm and runs warm in traffic afterwards has a damaged front end rather than a failing thermostat.
Mirror housings and glass, which on a modern car carry the indicator, the heater and often a blind-spot module.
After any significant storm, turn the lights on in daylight and look closely at every lens, then look through the grille at the condenser. Both take five minutes.
Potholes on both sides of the line
The freeze-thaw cycle here is severe — cold enough to freeze regularly, mild enough to thaw between times — which is precisely the pattern that destroys road surfaces.
A hard strike reaches beyond the wheel: bearing races brinelled, steering geometry moved, control arm bushings torn under shock loading, and sometimes a bent strut rod that binds. An alignment after a significant impact is part of the repair rather than an upsell.
A bent rim holds air and looks fine and produces a vibration that survives every rebalance. Ask for runout before buying a second tyre.
A wide range at both ends
Kansas City runs from genuine ice storms to genuine summer heat. Batteries take the worst of both: summer runs the chemical clock that destroys them and winter reveals the damage on the coldest morning.
Replace on age, before winter, rather than on failure in a car park. Four summers here is a full life.
Winter treatment is applied on both sides of the line, so the salt-belt failures apply regardless of which rule book you are under — corroded brake lines, seized caliper slides, wheel speed sensors bonded into knuckles.
Checked