Hey, Nebb,

Why focus on the trailer? Why not focus on the problem, which is that your wife doesn't want to sleep on the ground? Get some high quality cots, and a decent mattress pad. Cost you about 150 bucks for each of you, tops, and problem is solved. That's what I did for my wife. Look at Cabelas for some good selections. A good quality cot will provide just as firm a mattress as anything in a trailer, for quite a bit less hassle and cost.
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Hm-m-m-m-m