After reading a few recommendations on the Forum, I ordered a set of custom sheets and mattress covers from AB Lifestyles Home Store. I gave them my measurements (our 2552 has two long beds because we don't have a slideout), and color preference (ivory or white), and got the sheets and covers a week later. I put them on the beds in May, and we've used them every night since. They've worn beautifully. My original set was ivory, and I just ordered another set in white. Info:
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www.ABLifestyles.net800-825-4533
I do sew and saw all the ideas for tailoring my own sheets, but these were so easy and go good -- though not cheap.