Hey all you guys that have walkers out there, I put on a " speed increase kit." I am pretty impressed, brings the speed from 5 mph to 6.5 mph, I find it easier to do zero turns and it sure saves time to the truck to dump. It only consists of putting in a small new pully on the jack shaft. Took about 10 min. to do. I would recomend it. Another thing, has anyone purchased the dump bins that fit inside the catcher? Are they really heavy with a full load, and are they messy? I have the big bag now and I have to unload it about three times because it's too heavy. Any comments? Thanks guys.