@DosArroyos Having spent some time in my teens on my great uncle and aunt's huge west-central Texas ranch, I understand your battle with mesquite. It sucks all the moisture out of the soil and roots can go as deep as 200 feet. They said as long as you get 2' of the taproot they won't come back. The ground has to be moist way deep as you said, so a limited window of opportunity. The main spots of removal were several hundred acres surrounding their deep well windmill-fed stock tanks. This was the 1960s and family had been at it since the late 1800s so no larger ones in the target area. My auntie and I hauled and piled up the mesquite and burned it taking several breaks to cool off in the stock tank since no one was in viewing range.
Much cooler here with high winds yesterday and lighter winds today. Overcast today, but no rain in the 10-day forecast. Amazing how much this wind dries the soil down a few inches. It got down to the mid-40s last night. Today high predicted at 70.