patent applicable idea

battery packs mounted in the undercarriage of semi truck trailers 
so that electric semi trucks could drive longer 
could be relevant when electric semi trucks drive with heavy cargo 
in the semi truck trailers 

next step could be to have electric engines 
between the wheels of semi truck trailers 

I got the ideas when I walked past a semi truck trailer 
and noticed that there were no gas tanks 
in the undercarriage of the semi truck trailer 

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