Size misrepresented?

Hubby and I just bought a new Attitude toy hauler. Everything we read said that the front bed was a queen size. The floorplan said it was a queen. So...we got it home and I went to Camping World because I thought it looked like maybe a Short Queen like we have had before. Nope..it is some weird size mattress 54x80. On the tag from the manufacturer it has been marked on in ink and the size written in. Has anyone ever heard of this size before? I contacted the dealer and they said it was from the manufacturer. They were not responsible for what the "industry standard" was for Queen Size (???) So I contacted the Manufacturer Eclipse in California. They said it sounded like the dealer had swapped mattresses. So once again I asked the dealer if it was possible that someone had swapped mattresses. End of discussion said the dealer. We will give you $100. towards a new mattress. NO bedding of any kind fits this weird mattress. I don't think a Queen size would fit in that space, either. Is it misrepresentation on the part of the manufacturer to advertise the bed as being Queen size? I didn't think to check the mattress tag before we bought it.