truck; CL:輛|辆[liang4]
卡 · 5 strokes
Origin unclear, but typically explained as being stuck between something above (上) and something below (下). The uses of 卡 to mean "card" or "calorie" are foreign phonetic loans.
车 · 4 strokes
Pictograph of a war chariot. The simplified character 车 was adapted from the cursive form of the traditional character 車.