I've always liked the Senecas for the drivetrain. Really unless you get into big time $$$ they are all built the same way with the same materials.
A buddy of mine hit me up yesterday, he's selling his 2008 36fs w 28k miles for $65k. I can get you his info if interested. If I had the time I would have probably pulled the trigger. But kids activities are pulling elsewhere right now
Look into a used Showhauler if you can swing it. They are custom built to customer spec with residential grade everything on a class 8 chassis (Volvo, peterbilt, freightliner etc)
heres a video that explains their process
[video=youtube;7yhKVPxr3kk]https://www.youtube.com/watch?v=7yhKVPxr3kk[/video]
Those things are crazy money..
Any chance it's the bunk model? Really would love to find one with the bunk bed option