[rverdlm]

We have! We put a queen size in our last trailer and when we bought the MS the mattress was ok, but we missed the SC. We bought a California king. It's longer than the modified king that comes with the MS and most other trailers that have a king option. The extra length is not a big problem. When we close the slides we just let the air out of the mattress and it just scrunches up. We also raise the head of the power lift bed which takes any pressure of the slide. We've been doing this for over 2 years without problem. The other advantage to this is we can find and use regular Cal King sheets.