26.585 MHz AM is a popular frequency for Latin American truckers and freebanders, and will often be active when the band is open. When it is really booming in, all the nearby frequencies (26.565 MHz, 26.575 MHz, 26.595 MHz, etc. will also usually be busy).
If you're hearing activity on 26.585 AM, check 26.555 LSB and 27.455 USB. If 26.555 LSB is super busy, sometimes you'll hear other SSB activity on 26.540 LSB and other "zeros" frequencies.