How does Jayco claim a "True Dome" roof for folding campers?

[Fast Freddy]

I am trying to rebuild my '94 Cardinal SD Designer Series roof and see in the brochure that they claim to have a "True Dome" roof. Well I would like to make mine like it should have been, but I cannot see any true domes, instead I see lots of true cups, like mine.
Can anyone help me know HOW they did this true dome as I am in the process of repairing my massive roof, and would like to know how to do it properly.

[Fast Freddy]

Or possibly and link to where some of the old timer jayco workers hang out?

[Grumpy]

It is 29 years old....Do you have an air-conditioner?

[Fast Freddy]

Originally Posted by Grumpy

It is 29 years old....Do you have an air-conditioner?

Yes, I do. But it was seriously compromised by water damage.