Ideas for a Motorhome upto £10K

 I'm trying to 'plant the seed' with my wife regarding the purchase of a motor home, it would have to be 4 + berth and as new as posible, no more than £10K.

Looking at the prices, in the classifieds the private sales are thousands below dealer prices, I know that everyone has to make a living but the difference in some adverts is double the asking price.

Any pointers please?