11% is outragous (I'm at 6.25% and that's too high).
You don't have to escrow your taxes and insurance, but most people do, otherwise you have to pay it upfront and then set aside enough each month to pay them when they come due. It's easier to just escrow them in, and most lenders don't charge a fee to do it.
About $100 a month is good for insurance, taxes depend on your area and if you are paying real estate (like a site built home) or tangile property (like a mobile home). Could be $20 a month, could be $200.
If you can swing the block perimeter foundation, do it. It will be far better in the long run. Skirting blows away, concrete doesn't..
