I understand, pulling the pod around ain't cheap. I just mentioned in another thread that we did 4 trips from MD to FL in 2011, but only one of them with the pod even though I would have preferred to have it the other 3. Two of the non-pod trips we slept in our minivan (our TV at the time). 4 people and a dog on one of them!
Since you'll have your EZ-up, get 1 oversize tarp, a large clear-plastic drop cloth and a dozen spring clamps. You can find the tarp fairly cheap online, spring clamps and drop cloth at any home improvement store. I have a tarp that can completely cover the top of 2 EZ-ups with a 4 foot gap between them. Covering just one it will cover the top (original cover isn't rain proof anymore) and one side. With additional clear drop cloth I can completely enclose two EZ-ups for bad weather camping trips.
I'm thinking you could set up your EZ-up against the van with the sliding door or rear doors open, then use the tarp to cover the EZ-up and bridge the gap to the van. Add the clear plastic on the other sides (clear to let light in) and you'll have a huge dry area to hang out without being trapped in the van.