We've got a '6' berth moho (read 4 berth plus converted dinette for the dog), which has six travelling seats. However the seats are shaped like an L, with a flat base and very upright back at right angles to the base. For anything other than a short trip, they become a touch uncomfortable - or so I'm told (as I get the drivers seat!). Has anyone got any advice on how to make them more comfortable? Is there anything on the market that would help?