I would be grateful to receive advice on the best configuration option for the following scenario....
My business has three websites/identities which all offer the same set of products at two different locations within the same country/currency. Freight is calculated and applied manually.
1 site only sells
1 site only rents
1 site sells & rents
I have found a rental extension which I believe will be suitable, however I am wondering what the best base architecture should be when I set up the business in Magento, eg, should they be separate websites, stores or store views?
Any help offered will be most appreciated 
Thanks - Gavan