I sold our old Galaxy full van with triple bunks to get the Expanda.
We have 3 kids and as others have said, there isn't a lot of room once they are in bed. None of them could sit up in bed and the bottom bunk was literally on the floor!!
My oldest is quite tall and even a few years ago watching her try and climb into the middle bunk was like watching a giraffe climb through a coathanger................limbs everywhere...lol
It convinced us that they were all only going to get bigger and soon wouldn't fit, so it had to go and the Expanda is a far better option IMHO.
The only downside for you would be the combo bathroom, but i guess compromises sometimes need to be made.
A triple bunk van with separate shower/toilet would be a massive van..