A Que is a new model that was created with a bit of a euro theme to it. It was only made for the 2007 model year, so you can go look up the brochure for it.
5.4 means it is about 5.4 meters long, or 17' 7" long. Both the RE rear entry and SE side entry models were that length, and that was the only two model choices.
I think the brochure would be your best bet for a floorplan and some pictures. You might want to Google for just trying to find out general info about the model. There's enough out for sale at the dealers right now that you should be able to find one with some pictures to get an idea. Since there were only 172 built before the closure, they are fairly easy to find now, but they will get more difficult in the future.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR