Welcome to the group. Extra knowledge is always handy.
Dump Stations can be found in Rest Areas, Water Treatment Plants, City Parks, Fuel/Gas Stations but the problem is finding them. I am a member of the Escapee's, and use Days End to find places to park for free or low cost, Dump stations and potable Water. Days End is continually update by its members. Updates can be downloaded 4-5 times per year. To become a member of Days End, you must first join the Escapee's.
'04 Newmar MADP, 1100w of solar, Rubicon toad