Karl,Liberty's used coaches that are trade in coaches against a new one are numbered the same as a new coach with an A after the number,ie if you bought coach 734 and traded your coach,your old coach on their lot would be 734A,the next trade would be 734B.If they purchase a coach it will be in the 7000 series of numbers.If it is a consignment it will be in the 5000 series of numbers.You are right it is IMPORTANT to understand the vin numbers.There is a 2003 chasis in south Florida for sale that is titled as a 2007,buyer beware!!!