The mattress is great if you like a bit more firm. I like how it came and how it feels, but since it is for my recreational trailer I am keeping it, but I don't think it would be a good mattress for my body all the time. I have been sleeping on it every night since receiving it-just an fyi.
Because most King-size mattress es are 14" thick...so if you offered a 2 to 4" riser to bring the bed back to where it should be you would have gotten a 10....
I am still not sure on the bed yet, planning to give it another week or so as a trial. The edges are soft so that tends to make things a bit uncomfortable for two people or sitting at the edge of the bed. Also, the main concern is that the bed is not a cool as I had imagined. I still wake up feeling hot. Finally, as far as comfort, the verdict is still out. My husband and I aren't sleeping through the night but we will see how we feel in a couple weeks. On a positive note, the shipping and setup process was breeze which was great!