What about full carpet kit with full vinyl mat over it.
I know it sounds like over kill...Lol....
I was considering bed liner on the tub but completely cover it with interior, ie,,..Carpet, Quarter Panels, etc...Nobody would see the bed liner that way.
Bed liner does scare me off too...But if it couldn't be seen, haha...
I just would like to protect mine forever. I used to think bed liner was the solution until I paid more attention on here a few years back...