Cabela's. It's a model specific add on for the Extreme Weather Tent...though for a $600 tent you'd think they'd just include such a simple add on instead of charging $50 for it seperately...greedy suckers.

I noticed that the Zeus 2 EXO/Classic is on sale at the Eureka outlet for $71. It's 3 season but it's very light, very proven design and single wall so it should stay fairly dry inside when setting up in the rain. I'll have to see how much shipping costs and maybe I'll order it. Even if it's not what I need for the road trip it will make a good spring/fall backpacking tent for around here.