Boy, that Scamp looks awfully small for a rainy weekend with 4 people rubbing knees. can you get an awning around 2 sides, that would cheaply increase the usable area on blistering hot, or rainy/cold days.
I'd just get an easy up to spread out a little. Generally we don't see much rain during the times I camp. But as you know, one good rain shower and all your stuff is wet when tent camping. Can really mess up your trip.