OK, finally found the one that I have from Sam's. It works rather well but it does need something to hold it down. Ez-up sells sand bags but I was thinking of something that would hold water but yet fold up flat when emptied.
I have a small LP heater that doesn't use electricity. It does a decent job of taking the edge off. I have seen guys with salamander heaters and that requires a generator. Just one more thing to haul.
Yours looks great for this purpose.
The combination of windbreak and a heater would certainly solve the OP's issue, but I'd think they'd be a major hassle to haul around and set up, IMHO.
You'd have to wonder how much heat you'd lose during setup, too, although I usually gear up in a snowmobile suit, so that wouldn't matter for me....
Dave C