I installed black-out curtains (cardboard) in the windows so we can sleep before the sun goes down. I am not sure it ever goes down in summer up there, at least not till long after I want to sleep. The picture is the bedroom at midday. There is a little leakage around the edges, but I did not even tape the cardboard in, so if that is too much light, we can work on it.
Also installed a spare tire I put together with a junk-yard rim and one of our old tires. I think it will be better than nothing if we need one 100’s of miles from a tire shop.