Well after months of searching, I finally found quality floor mats that fit an E-450 chassis on my class C. They fit perfect and look great. They are WeatherTech #W51. Just look up Ford Econoline E-se...
Yes, it should be easy to trim. I figured we will try them as is and then see what needs to be done. You will find them with the throw rugs and such, near housewares and storage bins.