I recently removed carpet from our dining and sitting rooms at home, replacing it with a vinyl plank flooring.
It came with the underlay already attached on each 48" x 7" plank. It cut with a couple of strokes of a sharp box cutter and a steel square.
Each plank clips into the next for a watertight connection on all four sides.
The thickness is 5.5 mm, about 1/4" in real dimensions.
While I have not installed any in an RV as of yet, when mine does get to the point that it needs doing, this WILL be the direction I head.
You might like to investigate this as an option if you feel like a couple or three hours on your hands and knees.
2015 Toyota Tundra Dbl Cab 5.7 V8
2017 Zinger Z-1 291RL "Harvey'