4 years old is still a baby in terms of reliability, barely out of warranty. There are 12 - 20 year old Toyotas and isuzus still running around pretty reliably. Have a 10 year old Isuzu with 200k ,few issues, nothing major. But crucially always serviced regularly at main dealer.
Don't buy 4 wheel drive unless absolutely necessary. Worse fuel consumption and ride and another thing to go wrong.