No problems about selling liquidated stock in a an offline retail format, in fact if you can generate good walk in traffic, you will be able to get higher prices than those on ebay.
I don't just mean saving the shipping, but people will pay a premium to touch and be able to purchase the product there and then. Backing your shop up with your own website is the perfect offline marketing strategy in my opinion.
It gives you a 24 hour sales staff, with the option of being able to drop into your store during trading hours to confirm the purchase if they wish.
Of course in this situation, marketing your own website is a lot easier as well.
As for selling items with retail branding, I am not 100% sure with the legals in the US at this point, but my belief is that you are not. It may also depend where you purchase the liquidated products from.
I know some liquidators that I know won't even mention the companies name in their advertising, it will be listed as K-@mt, or something similar.
I am actually trying to confirm that legal information myself at the moment.
Have you considered where you are going to source your products from, sounds like you are talking about a truck load to stock the shop, and retain enough to restock so your cash flow doesn't dry up in between loads.