Tough to comment on the cooling topic other than to say it seems like you should be heading in the right direction... I've been extremely happy with...
I have had no problems sleeping in trailer the last several years. They do have plenty of camp sites, and more overflow camp sites if needed. But it...
OR.. just ask someone with an enclosed paddock area. Should be plenty of room for a sleeping bag in most of them .. maybe even the guy you're crewing...