Welcome to the cult Orville.
One word of warning ... owning a cute little
fiberglass travel trailer ... and this website ... will soon become an addiction for you!:) :)
There are several Compact Jr. owners who hang out here. I'm sure they will answer your question.
But until then, can you post some pictures (external and inside) of the new addition to your family?
The diamond tuck wall covering sounds like aftermarket to me. But I'd like to see some details.
A number of folks have done "off frame" restorations of their rigs, which would account for the wall covering going under the cabinets on your trailer.