Roof contruction

After 3 decades of owning TTs we will be retiring next year and switching to a motorhome, something like a 5 year old gasser in the 30 foot range.

Can anyone point me to brands/models which DO NOT have a rubber roof? I saw a Winnebago add touting their 1 piece fiberglass roof and a light bulb came on.

If no brands use rubber roofs I apologized for my ignorance.