For each truck, there are 3 possible cities. This gives $3^5$ possibilities. Similarly, there are $5 + 3 = 8$ possibilities for each package. This gives $8^3$ possibilities. Thus, altogether, there are $3^5 \times 8^3$ possibilities.
For each truck, there are 3 possible cities. This gives $3^5$ possibilities. Similarly, there are $5 + 3 = 8$ possibilities for each package. This gives $8^3$ possibilities. Thus, altogether, there are $3^5 \times 8^3$ possibilities.