Poorboy:
I have a JD 5300 MFWD and it can have both a weight bracket and weights as well as the loader on all at the same time. The bracket and weights sit below and between the arms of the grill guard. I assume this is still possible with the newer series. I dont have a weight bracket for my tractor but for my tractor it was a fairly large approx. 4"x4" peice of cast iron and I imagine not cheap. The suit case weights then set on the bracket. Call a dealer for prices of both. Putting fluid in the front tires of a 2-wd tractor will probably not add much significant weight. I assume the mower you mentioned is a rotary mower. I leave my loader on almost all the time when mowing. Without the loader on, my front end is also light when using my 6' bush hog. Other than the loader occassionally in the way for tight areas or on steep hill sides, why do you prefer it off? (I have caught a few fences with the loader - usually when backing up an not watching the front.) Unless your ground is rough, I would leave it on. If you dont want that much weight, just remove the quick attach bucket before you mow. With the bucket removed, the remaining weight of the loader is probably near that of a weight bracket and weights for holding down the front end. Putting weights on a off can be a chore on any tractor. My large IH tractor can lift 16,000 lbs on the rear. I have 20+ 100lb plates for the front - no need to go to a gym for a workout.