The Aviator air suspension is a known trouble spot — air struts, lines, and the compressor can leak or fail, and repairs are expensive.
Confirm the vehicle sits level and raises/lowers correctly; listen for the compressor cycling excessively. Run the VIN at nhtsa.gov/recalls and confirm any open campaigns are closed.
Est. cost: $1,000-$3,000+ per corner if struts or compressor fail
Source: AutoVetting editorial