We've checked with SumoSprings in the past with this question and they have told us that between 1/2 inch and 1 inch is standard clearance between the frame and the SumoSprings like the part # SSR-121-47 that you referenced. view full answer...
I have a seat cover that will work great but there are no custom fit options for bench seats on your Pleasure-Way Plateau Motorhome. I recommend the Aries Automotive Seat Defender Bench Seat Protector item # AA3147B. This black cover is 63" wide x 58" tall. It has two covers that go over the headrests with hook-and-loop straps. It also has cutouts that will open so you can access any seat belts.
I have linked a review video below so you can see what this cover looks like and how to set it up. view full answer...