When I bought my late model like new R Vision Trail Cruiser TT in 2003 from Camping World I was given manuals or pamphlets for various systems of the TT but not the TT itself. Mostly appliances as I recall.
Some TT have the model number on a small placard near the water tank intake or the entry door and/or on the inside of one of the overhead kitchen cabin doors. Also check inside doors of the lower doors under the sink.
Use a detailed description of the TT on a google search including word "floor plans" and this will yield many links.