A blocked or frozen evaporator (coil mounted in the cab) will cause a low suction pressure rather than a high discharge pressure. A blocked condensor (coil mounted by the radiator) will cause a high discharge pressure, but I have seen some extremely high discharge pressures and still not cause the belt to slip.
You need to find out the pressures first, but if I had to guess, I would say that you have lost a bearing in the clutch or you've seized the compressor. If the pulley will not turn with the clutch de-energized, you probably need a a new clutch assembly. If the pulley turns but stops when the clutch is energized, then you most likely need a compressor. The major cause of compressor failure is the return of liquid refrigerant to the compressor because of low air flow across the evaporator. (liquid refigerant is a solvent and compressor bearings and wear surfaces hate that)
Of course, this is all assuming that you do not have a plugged drier or expansion valve, which would look like an undercharge when the gauges are put on, and then you added more and more refirgerant until you overcharged the system. That too, would cause the belt to slip.
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