We used to do this when I was doing preventive maintenance
programs for my customers. Check your fluids and engine first, warm the engine for a few minutes while you check the dock lines, especialy the spring lines. Put in gear
forward at low rpms for a few minutes, then gradually increase the rpms to about half your usual cruising level, leave it there for a bit while inspecting the shaft log, engine vibration, belt tension, etc.. Then reduce to neutral, go in reverse a couple times, then neutral for a couple minutes while rechecking the engine and shaft log, then shut down. Diesels need operation under load, and by varying the rpms you keep the juices flowing, metaphorically speaking.