There are a few really nice floor mat options for your class c motorhome on the 2020 Ford E350 chassis. A very popular semi-custom fit option is the WeatherTech All-Weather Front Floor Mats which come in Black # WTW51, Tan # WTW51TN, and Gray # WTW51GR. They are flat (no curling on edges) and are made of weatherproof, pliable rubber that will do a great job of keeping your interior safe from spills and dirt/mud.
For a better custom-fit floor mat setup there is the WeatherTech front mats... view full answer...