Kubota tractors with loaders are very good quality. Not sure how big the l series is, but either way the loader would be handy as tou would most likely need to do some digging around the stump before pulling on it. If i remember right, you said the stumps are 1 foot diameter, if so a front end loader would do a good job. Probably be a good investment. I have pulled stumps up to about 8 inches with my 4x4 truck, bur still need to do some root digging and cut a couple off to be able to gwt the stump out. I leave the stump 3 feet tall for leverage. Its hard on a pickup, but its all i got.