Sleep Revolution 8" Sport Memory Foam Mattress

Does anyone have a Sleep Revolution 8" Sport Memory Foam Mattress with Celliant Sleep Technology? If so what is the true overall thickness of the mattress and how do you like it. The mattress is advertised as have 4" of high density foam and 2" of memory foam with a cover. That only adds up 6" plus a little for the cover. We're trying to decide if this would be a good replacement for our truck camper short queen mattress but if it is really 8" it would be too tall.

Thanks