Add a room

Thanks for the suggestions. Our dogs barf if they are in the vehicle for 10 mins as they were never taken driving as puppies, besides they are the breed that is not readily acceptable everywhere. Our 5th wheel is a 22.5ft box, no slides and with not enough room to stand in the bed area. We got it with the idea of better gas mileage, easier to manoeuver, access to smaller campsites etc. We really like the layout, but for an extended stay we were thinking an add a room would give us extra space that a bigger trailer would already have. Would also be cheaper than changing rigs. Seen several ads looking for add a rooms so if it doesn't work for us we could always sell it!!