Thanks for the tips! That campsite near Cordoba looks perfect. I'll have to give that iOverlander a try. It didn't work so well last time we were in Mexico but that's probably because our cell service was sketchy. Again, Thanks for the tips!
As far as I know there is no place to park other than gas stations or toll booths in or near Orizaba, your next RV camp ground will be Las Americas trailer park in Puebla.