A zombie on the monster plate produces a 2-strength signal
Overhead view of unloading stations 1 & 2. The 1st stop combines signals from moon and sun to release the cart only after the very last ray of sunlight well after sundown. The 2nd stop holds the cart until the very 1st ray well before sunrise.
Sensor at left, only first two repeaters lit
A zombie and spider together on a monster plate produces the spider's 4-strength signal
Hopper cart loading at farm-chest. It'll move when the moon sensor powers the slanted rail.