I think the biggest problem national dealers have these days is customers are not interested in paying a little bit more for a well known brand there quite happy to rent a unknown brand at a lower price especially in this climate every one expects good service as standard its all about money and if the big dealers dont address the problem and being able to compete with prices with the local dealers then they have big problem that needs addressing.
Its a bit like buying a dvd player out of an electrical shop why pay more when you can go to a supermarket and get it for half the price ok it might not be a well know brand but it does the job and last just the same time.