What is needed?

On a similar theme I saw something by Ecoflow called a charger which delivered 800 watts to your ecoflow by attaching it to your truck battery and apparently taking advantage of the surplus power created by the alternator and charging ecoflow with just 2 hours driving, could there be a similar product to charge the leisure batteries at a super rate, no need to rely on solar if 2 hours driving can fill them up?? IMG_1332.pngit’s one of these (y)
 
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