1)  If the seller knew of the age of the motor home, he/she/it may have committed fraud by misrepresenting the age; but if the seller did not know, then there may be no cause of action.2) Furthermore, you could not rescind the sale (i.e. return the motor home and get your money back), unless the one extra year of age is a critical, or material, difference. However, if there was some misrepresentation, you may be able to recover the difference in value between a 6 and 7 year old motor home. (E.g. say that being the extra year older means its "blue book" value is $1,500 less...you might be able  to recover that amount.) However, if the seller will not voluntarily pay this amount, you'd have to sue, which may not be worthwhile economically.