The Tiffin Allegro RED is basically a de-featured Tiffin Phaeton. Not really a new design model.
The Tiffin RED uses a Cummins ISB engine that is commonly used in many motorhomes and gets wonderful fuel mileage.
With any 2009 Tiffin there are three items that need to be checked and have an extended warranty from Tiffin.
Some or all of these items may already have been changed.
1) New style wet bay floor 2) Roof can get small cracks on the radius edges
and more uncommon 3) slideout floor problem on drivers side front
Visit / join
http://www.tiffinrvnetwork.com for a group of very knowledgeable Tiffin owners