I've purchased a very basic old Outback camper, we haven't stayed in it yet, I believe it would be approx 14ft x 14ft when it is opened up and the annex is on. We are going to use it at Easter and because it could rain I would like to cover the whole thing with a tarp. I guess my question is what do others do and would I need to have a bar go across the middle to keep the tarp off the tented area. Any ideas and advice would be greatly appreciated.