It is obvious by the number of post on this topic that our forum is divided on this topic. My personal opinion is like one member said quoting George Carlin, What can it hurt. It may or may not add to stability, but it for sure adds some traction. I think is is preferable to add 50# of weight to the tire rather than hang it on the frame as far as wear goes. As for dampening, the 25% air in the top will dampen quite sufficiently and I have never heard of water creating a problem with steering stability in a tractor. I cant believe that it would even be noticeable on one of these small CUT or SCUT since they at most would only hold 4-5 gallons of liquid and many of them less than that. Folks talk about wear on the tires: most of the wear on a 4WD front tire is from the overspeed ratio of the front to the read tire. It is set up to run a little faster than the rear when new like 1.02 to 1 or something like that. As the front tire wears from this minute slipping, then the ratio keeps getting closer to 1:1 and the wear slows down. I personally wouldnt buy any tractor if the dealer told me I couldnt load the front tires. I would simply tell him that if his tractor is designed so light that adding 50# or weight to the front is going to damage it then I dont want it because I plan to put more than 50# in my FEL which would be the same axle loading regardless of where the load came from.
That is just my 10cents worth.