Bertha is going to be the sort of camper that sets up camp and doesn't really do a lot that doesn't involve a lot more than sitting around drinking, paying a visit to the local swimming hole (or pool) and chowing down. As others have posted, her best bet is to rent a trailer of some sort. Otherwise, she is going to be hellishly uncomfortable.
I can't really imagine dummies giving really useful advice when it comes to camping.