Need pics of rhino lined tubs
CJKrawler
Old Time Jeeper
Putting the carpet over top of the liner won't protect it from rust. Carpet holds water, which will cause it to rust faster. A good liner will not have any issues protecting the inside of the tub. The underneath you will need to protect as well. From experience, you will want to put floor mats in the front though. After 4 years, I started to wear through the herculiner on my TJ at the gas pedal where my foot rested.