If you can rent and operate a Bobcat, you should have no problem operating a small bulldozer or excavator. Bobcats are not really made for that kind of work and you will probably have to spend more time and money with the Bobcat than a single day with a dozer or excavator. If you plan to cut the trees before using the equipment, it is essential that you leave a ???tall??? stump so that you have some leverage to push against so that you can break the roots loose. I have found it easiest to simply push the entire tree over stump and all. If you can find someone to rent you a dozer with a brush rake attachment on the blade, you will have a cleaner brush pile (i.e. less dirt in the pile). Unfortunately, most rental places I???ve dealt with don???t offer brush rakes.
If you want to get the most of your house logs without damage, dig the roots up with an excavator or backhoe and push them over. If you are using a very small backhoe like I have access to, you can put a winch cable high up in to the tree, dig on the roots some and then pull it over with your winch. I always use a snatch block off of a nearby tree so that my truck is well off to the side of the tree fall area. Once the stump is out of the ground, you can cut it as close as you like.
If you push your house trees over with a bulldozer, you might get some dents or gashes in the log depending on the thickness of your bark and how rough you get with the tree.
As for the difficulty of digging up stumps that are flush to the ground, let me put it into a time perspective from my experience. I was pushing 16??? to 18??? diameter trees over in less than 5 minutes if they were stubborn. It took seconds if they were easy. Bare stumps that were cut close to the ground took up to an hour depending on where they were located and how much time I had to spend in the hole cutting roots by hand. Of course this is all dependent on the size and condition of your equipment. I was using an old John Deere 450 dozer that weighed around 15,000 lbs.
BTW, I expect that dozer rental in Alabama is cheaper than the NorthWest.
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