All in all, for use in an RV, a gardeners kneeling pad would probably be the most convenient thing to use.
- https://www.amazon.com/Kneeling-Pad-Comfort-Gardening-Exercise/dp/B0734KSZKS
- https://www.amazon.com/Kneeling-Pad-Comfort-Gardening-Exercise/dp/B0734KSZKS