Hey, RBB-enjoying this thread!
Here on the IA/MO border Eastern Red Cedar, Honey Locust and Osage Orange ("hedge") are what we battle. Oaks and cottonwoods too.
Can mow off a pretty big cedar and he ded, but the thorny locust and tough hedge can't be very big or you've scattered thorns all over.
I have a shear that mounts on the 3 point and a brush grapple for the loader on a tractor with a shuttle, works good, but it's SLOW going.
And locust stumps need treated, or you just make 'em mad and where there was one 6 sprout back.
Any advice on pullers, skid steers? Do you have to use chemicals to prevent regrowth? Have to mow every year?