Hi all, i'm brand new to the board. I have a Deere 790,4x4, w/FEL & 7' rear blade. Today I was plowing 2 feet of partly cloudy from my driveway, but, the tractor just doesn't get enough traction, tires always spinning, even in 4WD. Even the slightest incline starts the tractor spinning. I'm thinking I would like to fill the rear tires (R4's) with liquid. Will this help my traction problem? I found a product called rim guard, which proclaims to be 30% heavier than h2o and biodegradible. Does anyone out there have liquid ballast for their compacts? Merry Christmas ~ Ron L (New Park, Pa)