I have had several emails back and forth with Calvin & Leanne and their RV park is very small and only for small "overlander" type RVs. Leanne did say there is a place to boondock at the end of their street. They lived at the Oaxaca RV Park for years so would probably know more about it than anyone. Here is contact info......
Overlander Oasis
(52) 951 144 3099
http://www.overlanderoasis.com
overlanderoasis@gmail.com
3ra Privada de Niรฑos Hรฉroes, Lote 2
Santa Marรญa Del Tule, Oaxaca
Mรฉxico CP 68297
GPS 17.04486 -96.64000