Sonoran wear and the heat factor
Tucson summers regularly clear 100°F and the high desert dust is constant. Like Phoenix, AC compressors, batteries, radiators, and rubber components fail faster than in mild climates. UV bakes paint, dashboards, headlights. Bodies stay clean (no salt, minimal humidity) but interiors age fast.
Tucson's a smaller, slower-moving metro than Phoenix — more retirees, more University-of-Arizona workforce churn, and Davis-Monthan AFB military rotations. Pickup mix runs heavily toward 3-10 year-old daily drivers from rotational populations and 12+ year-old retiree estate vehicles.
Retirees, snowbirds, and DM AFB
Tucson has one of the country's larger retiree populations per capita. Estate-vehicle pickups are common — older relatives leaving low-mileage cars that families can't drive cross-country. Snowbird turnover (winter-only residents) generates additional supply of low-miles, sun-baked vehicles.
Davis-Monthan Air Force Base anchors a steady military pickup stream. Service members PCS in/out generate well-maintained 3-7 year-old vehicles for sale.