I just got an e-mail from the dealer about the specifics of getting loaded rear tires when I buy the tractor. Here's what he said:
"We load tires with a product called Rim Guard. It is made out of Beet Juice and other natural products and is environmentally friendly. It weighs 10.7 pounds per gallon and does not freeze. To load the R4 Industrial tires would add 430 pounds to the back of your tractor and cost $157.00. We load tires at cost not making any profit on it because we feel a tractor is safer with the rear tires loaded."
I've decided to go the route of the loaded tires and the
B8160 ballast box. Yes, it's gonna be a mess if those tires get a puncture and start bleeding beet juice all over the place, but for an additional $157 for both rear tires, it just seems ridiculous to pass it up. Plus, the dealership is just 4 miles away if I ever have a problem.
Update: I just discovered that Rim Guard is made from an agricultural byproduct of sugar beets (white flesh), not red beets. So no bloody stain if you ever get a leak.
John