These are great questions
1. Will it keep us warm enough? how do you know this? its a double layer tent but to be honest i only saw one thickness (sorry i really have no idea about tents!!) also i have a 4 season sleeping bag?!
2. Will it keep us dry? i think so - i have read some positive reviews!
3. Is there enough room for us to sleep while still having enough room to keep our gear (that needs to be protected from the elements) inside? well its a four person tent and there are only two of us plus we have the car to put things in aswell - i layed down in the one in the showroom and did a snow angel type movement in it (luckily it was quiet in the shop) and i had lots of room.
4. Is it easy to erect (in the dark,wind, etc.) by one or two people? hmmm i have no idea about that may have to go back to the shop and ask!
They this tent up in the showroom and i could stand up in it with shoes on and im 5'9 and Andy is 5'8 (and a half!!
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Can the windows be zipped closed in a sharp wind? yes all the front closes down fully so it looks like the back - but this one had windows with curtains and it opens up alot at the front which i thought would be quite good so we dont feel to claustrophobic (not sure thats spelt correctly)
Is there a rain tarp to put over the top? it has an inside sealable bedroom and then the over peice ? is that what you mean?
thanks so much for your help on this!!