As far as the steering, check the steering rack bushings for play by observing movement, while having someone turn it 1/4 turn each way.
Also front end should be tight, check sway bar end links, get an inspection/ alignment once as year.
Rear diff should be serviced every 40k miles, transmission fluid & filters, and service the front diff & transfer case. Hoat coolant every 5 years.
Always refer to fluid specs in your owners manual for the correct products to use.
Spark plugs every 40k and using NGK as per under hood sticker.
Has the serpentine belt & tensioner assembly been replaced ?