Lone camper question?

Critical to my issue is me being a lone female (I only have one pair of hands). I want to try camping so have already purchased a small 2 man tent, stove, windbreak, portaloo etc. so can confine my JRT and myself. I don't have overhead cover (the tent will be for sleeping in only) I am therefore looking for a standing height cover which I can sit beneath/cover my stuff should the weather turn bad. Whatever I purchase needs to be 'erectable' by me alone. I will have a car with me so am thinking about pitching it over the rear end of my hatchback car. Any suggestions for weatherproofing etc? Any other suggestions welcome also. Thank you