Here is the picture

Here is a link that might be useful: Loading tires

I loaded the tires on my CC and it made a world of difference in the traction it now has even with the turf tires and no weights other than the fluid in the tires. I would reccommend it to anyone.

What about chains/weights?

For really better traction on bad surfaces - snow/ice and for hilly conditions chains are the way to go. I used to add weights on the back of the tractor previously and they do help. I decided to load the tires as the weight only weighs down the wheels/tires and not the axles or frame. Plus it provides a lower center of gravity which is always good.
Another factor is cost - cost me $18 to add 80 pounds with tire loading, suitecase weights would be about $100 for the same weight.
Only concerne is the loaded tires are always there not just in winter when I need it for snow plowing. Also weight of tires on lawn when mowing may not be good. Possible extra strain on the trans/engine moving the extra weight? Add on weights like suitecase weights are easy to add only when needed.

Just learning about garden tractors what are suitcase weights.

See http://www.jimsrepairjimstractors.com/tractor-weight.htm - good pictures of them.

Just loaded the tires in my JD 210. It took 16 gallons of washer fluid. (23*10.5*12) It took a little over an hour but worked well. Have not gotten snow since but appears to have a lot more traction now. Much cheaper than buying wheel weights.