dwb,
I loaded my tires with Windshield Washer Fluid. !0 gallons in each tire, That adds about 180-200 lbs to the rear and makes a huge difference when using the FEL, both for balance and traction. You can buy a special valve at any NAPA auto store for around $6.00 and if you have one of those little transfer pumps that hooks to an electric drill you can do it yourself in no time. I used a 5 gallon pail, filled it with the fluid, then transferred it right into the wheel. A word of caution though. When you jack up the rear of the tractor, make sure the jack heavily favors the side of the tractor that has the tire your filling. I ballanced mine right in the center the first time and about half way thru the filling the whole tractor suddenly listed in my direction due to the added weight I was putting in the tire! DUH!