I don't use my upper bunk, but I got a memory foam mattress topper at Costco for my bottom one, and it's quite comfy. You already have the provided mattress in the bunk, right? The memory foam is fairly heavy, I'm not sure you could travel with it in place, and it would be a pain to lift it up and down at each destination. They do make some amazingly-comfortable air mattresses nowadays, and if you look at the camping ones, they're not that high -- so that might be your best option? Just my experience, but in my opinion -- the 139 is an excellent one-person trailer but not really suited to 2 people unless maybe in the summer when most everything is happening outdoors.
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