I bought a one piece front mat for my Chevy Express cab RV from mats4less.com
http://mats4less.com/chevrolet-express- ... -mats.html
The cab in my new RV is the same as my Roadtrek was. The mat fits ok. There's a small gap at the corners of the doghouse. I'll try to remember to post a photo.
The mat is made by Lloyd Mats. It's their Rubbertite line. Part # is LM3178080. You can pick from Tan, Black, Grey or Clear.
For Canadians: - the AutoAccessories4Less Family of Stores consolidates shipments to Canada. The product comes via UPS but you avoid having to pay brokerage fees etc.