The first thing we purchased for our 37GT was a new inner spring mattress. I'm not sure if all Thors come with a Denver Weekender or a better grade. It was very hard and thin. Like SuperD said, it was about like sleeping on the base. A topper wasn't an option since DW had an allergic reaction to one that we had in the past. We are very happy (and comfortable) since we replaced it. It came all rolled up in a box and we just put it on the base, cut the plastic wrap so it could unroll and after a few hours it was expanded and ready to sleep on.
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