They are vicious trees to push. You will be pushing one and it will grab the limbs on the one beside it. A cab is a must. You can't worry about the glass because it's going to get broke. I don't get greedy pushing them, one at a time to the pile and then they are hard to control some times. One thing about them,they don't carry much dirt to the pile and it will burn to absolutely nothing. I use a 963 or 973 on them, my buddy with a dozer won't even venture into them.