A search would give you a more detailed idea but basicly:

S class would be the large cars
E class the middle of the road
C the small line

The numbers on the back tell you what the car is, for example:

300TD- 300 means 3 liter engine, T means touring (wagon) D means diesel
560SEL- 5.6 liters, Sounderklass (s class), E stands for Einspritzing (sp?) it means fuel injected, L means long wheel base 6in added to the rear seats.

But this changed in 1994, they got rid of the "E" because all cars are fuel injected and got rid of the L. For example the 500SEL turned into the S500. The 400E turned into the E420.

If you want a really big car the W140 made between 1992-99 is bigger then the W126's. Although the W126 isn't small.

Edit: for full size ski's you will need a roof rack unless you get a wagon.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200