1983 300D w123
I'm planning to buy 4 new snow tires for this car. How is the 300D in the snow with snow tires? I'm not going to stud them since I'm in RI and the roads are not iced up all winter. I have two choices, my rear drive Mercedes or my rear drive Mazda. The Mazda had 4 new snows about 5 years or so ago and if I remember right it helped quite a bit. How much weight should I put in back. I generally like to carry kitty litter since it'll help with traction too if needed. Mostly, I'm asking those of you who need to drive these in really crappy weather, do the snows make a world of difference on these cars. I used it last winter on not very great regular tires and got into a lot of trouble a couple of times. Going to use 195/70 14s. Firestone winterforce tires.
Thanks for any and all advice.

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1985 300D 197K - Semi-Daily Driver Diesel
1998 Volvo V70 AWD 226K - Daily Driver 2
1998 Volvo S70 140K - Wife's DD
2003 GMC Sonoma ZR2 Option - Rusty Truck
THE BABY 1958 220S Sedan 66K All original, never restored and never will be.