We were working on a ballfield yesterday with the 1070 when one of the front tires went flat. One of the guys noticed that the front tires had tubes in them. We had the dealer replace the front tires last fall because they were getting worn and had many plugs in them and we needed other work done on the tractor at the time so I didn't think it was a big deal. I called the dealer service dept and asked why they put tubes in tubeless tires. They told me that once you break the factory bead then the new tires will always leak. What a bunch of bull!!! We have NEVER, EVER put tubes in our tires on any of our machines. The worse case was with a Kubota F3060 mower when the calcium filled rims rotted out from the inside so we had to replace the rims and the tires. So yesterday, we used a portable air tank to get the tractor back up on the trailer, I brought the tractor back to the shop and put the rim on the tire machine, pulled out the tube, the rim was in great shape, applied some bead sealer and a metal screw on valve stem and viola, NO LEAKS!!! Once, if ever , I get caught up, I'm going to pull apart the other front tire. Turns out some gunk managed to get in the valve stem hole in the rim where the tube stem was sticking out. Tubes are bad, bad, bad!!!!! Dealer is starting to make me think that along with some other questionable jobs they have done, that maybe I should look elsewhere.