Valterra has a sewer hose carrier like in the photo and comes in different lengths. You may want to check how long your hoses are when compressed before you do anything. They all have different lengths when compressed and some don't compress at all. If you have a large enough storage compartment, you can always re-attach the hose ends and put them in the compartment.
Since it's finally sunny and decent out today, I'll be installing a Valterra hose carrier under our TT frame. FWIW, it looks like Valterra has bought the Dwincorp line of hose carriers. The Valterra carrier we just bought says Valterra on the exterior side of the door and Dwincorp on the rear. The Valterra carrier now has a hinged door which I like better than the old twist style.