Yea! It certainly feels like a magic carpet when we walk on it barefoot. I was actually unsure about it fitting, 5x7, when I brought it in while we were stilled parked. But later that night in CG, with the slides out, wow! What room!!
As for the lithiums, since we only acquired this coach just over a week ago, I cannot say. But I do know the real trick is the roof mounted solar system that keeps them charged, same from the Gen and of course from shore power.
They can go down to zero charge and be brought back up to full. They are also total zero maintenance. The prior owner really did a high tech number on this coach and was completely anal retentive on the maintenance. Yes, we were extremely lucky that it went up for sale and we were able to get it.
I will tell you that I had been seriously researching MH's for the last 3 years and I found Tiffin to build the best quality coach for the same price point as the other diesel pushers in this class.
If I can get more info on the lithium batteries I have, I will certainly let you know.
Mark & Haydee (pronounced Heidi)
2010 Allegro 38QBA "Alle"
2008 HD Ultra Classic