I'm not a fan of adding Calcium Chloride, an oxidizer, to tires, especially tube less tires. It will cause rims to rust in a heart beat.
I really don't think tire ballast will do much for stability or traction because the tires are not that big.
My 2004 T5C has narrow front and rear tires. The width of wheel base is only 4 feet.
the tires on my 2000 T5D is like newer Terramites, it's front and rear tires are much wider making it less likely to tip over. Not sure actual tire size but tires stick out the rear fender on the D model and are completely under rear fender on C model.
Now when it comes to traction, I feel I have better traction in mud with the narrower tire. The wider tire sits on top of the mud and spins.
Both the C and D models have the exact same front and rear axles.
The bolt pattern for both rims are the same.
I use a 300# weight that I pick up with back boom to transfer weight off front wheels and put weight on rear wheels when loading dirt. I find transferring weight off front wheels is needed when loading sand because he front wheels will go down in loose sand. The more I extend the rear boom back, the more weight I transfer off the front wheels.