The Clue Truckloads, say
The Answer ALOT
The answer "ALOT" fits the clue "Truckloads, say" because it suggests a large quantity. When we think of truckloads, we imagine a lot of something being transported. The word "a lot" is often used informally to describe a big amount. So, it makes sense to use "ALOT" as a playful way to represent many truckloads.