trucks:[
     wheels:[
             {name:"xyz",
              mechanics: [
                     {engine:'50cc',
                     attributeScore:100},
                     {....} ,{...}
                    ]
              },
              {name:"gcd",
              mechanics: [
                     {engine:'80cc',
                     attributeScore:90},
                     {....} ,{...}
                    ]
              },
            ,{...}
         ]
      ]