The last time I was at my local JD dealer my salesman wanted me to read a small brochure printed by Deere about the importance of proper ballasting when using a FEL. It made a point that if you properly ballast the rear of your tractor it would reduce the weight on the front axle and distribute it more evenly upon the entire frame and both axles.
It further stated that unless your tractor has ballast toward the rear, frequent FEL use will gradually lead to engine, transmission, and front axle repairs. While I believe this to be true, it makes me wonder if anyone has experienced damages to their tractor that they feel would have been prevented if they had been using the recommended rear ballast.