Wallpapering RVs is trendy and tricky at the same time, because RVs are subject to drastic temperature fluctuation we do not recommend peel and stick products.
This is not a professional repair, we recommend doing it to save your wallpaper from more deterioration but individual results may vary.
Look for the service before purchasing the wallpaper. Talk to the installer about experience with those specific materials...
Use a measuring tape always! Avoid measuring with phone apps since they are not as accurate as they seem.
Removable peel and stick wallpapers are not safe when used on textured walls.