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All load range C tires have six plies; all LRD's have eight.
The decision to jump to a higher load range should be based on the individual load (weight) each tire is carrying. If the load is within 15% of the maximum load for the LRC, then moving to LRD is reasonable. The decision should not be made simply on availability, or the often minor difference in price between load ranges---otherwise you may put yourself in an overinflation situation.
You also need to consider your axle load ratings. For example, two LRD tires could carry 5080lb, but an axle may only be rated at 4400. If you are over the axle's rating, you must first lessen/redistribute the load to get under it.
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