Practice question Why must tanks not be loaded totally full? Liquids expand as they warmFull tanks weigh lessFull tanks have more outageCalifornia bans all liquid loads Answer: A — Liquids expand as they warm The correct answer is shown above. Try the full quiz for additional practice. Practice more: California CDL Tanker Vehicles Endorsement Test Practice Questions - California Commercial Driver License Tanker Vehicles Endorsement Test Exam →