Looks like years of abuse, if you just bought this vehicle in the last month I would bet they were using a wax with heavy filler/colorant to make the paint look better and everyday a little more is wearing off (common practice at many shady used car dealerships). Proper paint repair is EXPENSIVE especially a vehicle this size with this much neglect, much easier to cover it up. Good news is that looks like it could be corrected, bad news is that it's a lot of work and pretty expensive if your not doing it yourself (no where near as expensive as paint though).