When I was in Quartzite last year, Oliver
had a show of their wares.
I forget what size Oliver
I was in but they had the same noggin dome as does my Casita
not had that bump I would not have purchased it (your personal height and the inside height of your egg notwithstanding, head room is very important to me)
So anyway, the Oliver
sales lady (I assume the owners wife) was telling someone about the noggin dome, "it increases the structural strength".
Perhaps your intuition tells you she was right but if not, as a mechanical engineer, I can assure you it does!
The Oliver and the casita
have an extreme amount of vertical load carrying ability due to the vertical noggin dome.. perhaps even an increase in horizontal stress capabilities.
How much of that strength is necessary?
Do Bigfoots have a noggin dome or a flat roof?
Do escapes have a noggin dome or a flat roof?
Do escapes or bigfoots suffer stress and fatigue cracks over time with a 100 lb air conditioner vibrating and bouncing on a flat roof?
This question goes arm in arm with an obvious truth: if you extend the noggin dome out to the very edge as does Escape
it increases the room inside substantially.
It increases the height of overhead cabinets.
It takes away one of he worst design features of the Casita, the LOW (too low) overhead stove vent.