Needed- Late model Dodge Truck AC help

The low side does not try to pump low? When compressor runs does it short cycle? If both sides stay high and you are sure compressor is actually turning, I'd say bad valves in the compressor

What is the history? Did someone over charge it or charge liquid "too fast" into the low side and take out the valves?

AND ARE YOU SURE YOU HAD BOTH GAUGE VALVES SHUT when taking readings?