Any roof requires maintenance, I have not had leaks with either of our Pumas I can't say that for a friends 2006 $45,ooo KZ Sportster toyhauler. Also the smooth fiberglass side panels may look nicer but the old style AL ribbed sides are easier to repair if need be, and do not have the delamanation problems that some smooth sides do.
As far as the bathroom issue I can agree with you on that, but there is a curtain that goes all the way across the bedroom at the end of the bed on the 356.
Keep looking for a dealer no matter which model you buy it is always better to see what you are getting before you buy. Even if you order one from another dealer closer to you. Our dealer does not stock toyhaulers but I made sure it was what we wanted at a show. He hasn't sent anyone but I offer if he had anyone interested to send them over (I live within 5 miles of our dealer).
The 356 sleeps 10 nicely 5 queen size beds. The main bed, the loft bed, 2 queens in the toyroom that lift up and the dinette is very large "U" shape. The back side seats in the dinette are smaller we have no troubles but some might. The side seats are standard size in a camper.
Towing can't help much on, I have an 05 Dodge duelly diesel. Just me but I'll not likely ever go back to a regular full size. I like Fords but will probably not go back to them either, the last few Fords we owned stayed in the shop too much. My Diesel F250 went through 3 transmissions in 112K miles, still have my Mustangs though....That was back when we had a Terry that weight 4500 lbs.
When comparing to our friends Sportster it has a few nicer features but for over $15K less We are very happy so far.