Correction to Mr. Mario’s (mp1270) answer, No. 1 never consider any car especially 4wd registered under a female name is used by a female driver (horrible driver anyways) only and not being abused by reckless driving in the desert. Many 4wd cars are registered under wives or sister’s name to take the luxury of 60% tinted glasses including the front (driver’s and front row passenger) and rear glass.
No 2 Desert driving dose not causes any damage to the under chassis it is mainly the body parts or engine due to unstable driving conditions.
No 3 tire expiry date is considered for storage only, if the tire is stored for 2years or more without mounting than it is expired.
When you buy a secondhand car only computer test is not enough, get an experts advice on the body repair also such as repainting or duplicate parts such as Head light, tail lights, bumper or interior.