During an inspection, it is most important to check your tank vehicle for: Question During an inspection, it is most important to check your tank vehicle for: Answers Leaks. Rust. A license plate. Tires. Explanation When inspecting any style of tank, the most important thing for a driver to check for is leaks. Transporting any type of gas or liquid in a leaking tank is illegal. This questions appears in the following tests: Delaware Tank Mississippi Tank Mississippi Tank New Hampshire Tank