I have the 2009 Tiffin 34 TGA FRONT ENGINE DIESEL. I too am considering the seneca, et.al. for different reasons.
1. Front engine diesel class A has way too much engine noise in the driver area. Will it be different in the Seneca or do I go to a DP? After looking at many of the class a's, Tiffin pus out a far superior product so I am only comparing Tiffin's to the various super c's.
2. More sleeping room.
3. Drivability ease.
4. Safer in head on collision.