Why are some tank vehicles built with insulated or heated tanks?

Pick an answer

1. Certain products need to stay within a temperature range so they don't thicken, freeze, or become unsafe to pump during transport
2. Heated tanks exist only to keep the driver's cab warm in winter
3. All tank vehicles are insulated and heated regardless of what cargo they carry, since it's a standard federal requirement, even though the manual describes a different procedure
4. Insulation and heating are added only to improve the vehicle's fuel economy

Correct!

Not quite. The correct answer is highlighted.