There are plenty of places that will re-do flooring in an RV. Probably not Rv dealers or the factory, but flooring experts. You can use vinyl, laminate, carpet, or tile, depending on your wants & needs, and maybe weight considerations in smaller RVs. I've replaced much of my carpeting with new and changed one area to laminate, and helped a buddy do vinyl plank (I have a lot of DIY flooring experience).
The basic problem is that an RV is a small area with lots of angles and corners to cut, furnishings to remove, etc. Many flooring guys don't want to bother - they like large open rooms with few technical challenges. The flooring pros don't mind it at all - they have the skills. Buy top quality flooring materials too, not the cheap stuff. Low grade stuff doesn't holdup well in the high moisture, variable temperature, frequently shifting environment of an RV. You aren't buying a lot of sq ft of material, so using better stuff doesn't cost much extra.
In Texas I suggest Ernie Ekberg
(but he is booked far in advance), and in Florida I suggest "Recarpet your RV" (Eric @ 352 324-2894), a mobile flooring guy.