I have a different size tire on my L3010, but here is what I came up with. I estimated the gallons required based on a chart I printed from Tractorsmart.com. My rear tire size is a std. R4. 420/70-24. The qty. I thought would be correct was 60 gals., but it actually only took 48 gallons, that is with no weight on the rear tires, the stem at 12 o'clock, and fluid slightly dribbling out of the stem which told me it was full. The fluid I used was the wwsolvent from K-mart that was on sale for $.50 a gallon. Each gallon weighed 7 lbs., for a total added weight of 336 lbs. I used a tire fill adapter from my local NAPA dealer, it is supposed to let you bleed out the air while filling- it doesn't. What I ended up doing was to take a 4 ft. section of garden hose, a funnel that would just jam into the end of it, and a garden hose ball valve adapter fitted between the hose and the fill adapter. This let me shut off the flow of fluid into the tire, and bleed all the air out of the tire as needed (every 2-2 1/2 gallons). I taped the funnel to the side of the ROPS with electrical tape, the funnel sat into the recess on the ROPS . I also found out that it was quicker to remove the bleeder valve from the adapter ( it is held in and sealed with an o-ring, finger tight seals just fine). If I had to do it again, I would use the same adapter from NAPA and Y adapter with a hose for a vent ,up to the top, next to the fill funnel. This would allow for a much larger vent area, and with a clamp at the top, I wouldn't have to climb down off the ladder to close a valve and vent the system. Doing it the way I did, it took almost four hours to complete the job. After filling the tires and adding 20 lbs. of air, I took it for a test drive. It really made a big difference using the ft. end loader, the rear tires didn't spin at all going into a big pile of partially frozen gravel, and, more importantly , the rear tires don't come up off of the ground if I lower the bucket suddenly. I hope this info helps someone out, now I just have to put on my chains and I'm sure the snow will stay away this year!