I have 26 acres in central/east Oklahoma, and these are rampant there.
When I bought my property (2019), there was dozens of these there (some just small saplings, some 8-12' tall, and a couple over 20-25'), and I also incurred flat front tires, twice, due to cutting these down.
One flat-tire time though, was totally and unfortunately my fault. Had cut some down, and some other scrub too, putting it all into a pile. By the time that I was able to burn, the grass had grown around the pile, and I didn't take into memory, where these nasty's were...
As I was dumping some new brushy junk into the pile from the grapple, I had driven into a side of the pile, forgetting that was where the needles/branches were. Looked down in my tire tracks, and said F***, as I knew what was coming as a result of my foolishness...
So, sharing my foolishness, to hopefully help someone else in their future, and be very attentive to these if you have the same situation of not being able to quickly attend to burning them (this is retirement preparation property, so I don't live there, and am there only about one weekend a month to get chores done); which was noted by others earlier, these nasty's hold their moisture for quite a while, and need time to fully dry-out, before you can effectively burn them; without a bunch of diesel or kerosene dumped on to quickly burn.
In the 5+ years of owning my land now, and going through those experiences, this is what I could offer for advise...
--Try to catch them when they're very young, back over with your brush cutter, and cut really low. Continue cutting low around that area for the next couple of years, not letting them re-sprout, recursively off the roots; as others had noted that these absolutely do re-sprout off of the root system.
--If you've already inherited land with grown trees, or adolescent saplings within 10' of height, take your time, and tackle cutting the branches off that you can, one at a time, then the trunk. Throw all the pieces onto a utility trailer (like another person had posted the pictures of, which I did the same thing), and safely transport them to a good burn spot. It may take 2-3 years, but they'll eventually fully die-out; but like my first reference, keep mowing each Spring/Fall season.
--If you've got full-grown 20'+ tall trees, pretty much the only option is to cut and drop them. Cut the branches off, and pile carefully. Cut the trunk every 3-5-7 feet, to try and get some of the moisture out of the middle(s). Then, burn it all where it lays... It will take potentially 3-6 months after you've cut the tree down, for the pieces to get dry enough to really burn effectively; getting hot enough to take the 'points' off the needles. When it is time to burn, mow out 10' from all the pieces (hopefully you have the space available), and burn it all, grass and branches and logs, to make sure you've burnt-out all the needles that may have scattered around as the tree fell.
These have been the lessons I've had to learn as a first-time land owner, and now it's just mostly mowing effort, and a beautiful piece of property.
Good luck to your success!