My husband and I just purchased a new 2010 Landmark Oakmont. Prior to upgrading from our 2006 Pilgrim Open Road (with a queen bed) we had decided to upgrade our bed at home with a new king bed (Sealy). When we looked at the Landmark, it showed that it had a king bed. When we took delivery of the new rig, we were very disappointed to learn that the king bed dimensions in the Landmark (70" x 80") are not the same as a traditional King bed in one's home (76" x 80"). When we bought the new mattress for home, it was for the express purpose of moving it to the 5th wheel and taking the mattress that came with the 5th wheel and putting it in storage with the rest of our stuff (we are about to go full-time). I assumed that a 'king mattress' was a 'king mattress'. (I understand a Calif. King is a different size. Imagine my surprise when we got the rig home and actually measured the mattress and learned of the size discrepancy. Incidently, I could not find anywhere on the Heartland website or brochures, what the actual dimension of the RV king mattress was. Unwilling to give up the comfort of our new Sealy mattress, I took a thread ripper, and opened the underside seam of the Sealy, trimmed off some of the base foam padding, my husband "cut" two rows of springs off, and reattached the side pieces, and sewed up the seam. (whew!) We were able to fit the new Sealy in the rig instead of the 'delux' pillowtop mattress that came with it. It would be really helpful if Heartland could put a few more details (like the actual mattress size) somewhere in the brochures.