Yes, you can use vitreous tile in RV's. I've used various porcelain and ceramic tile in a few RV's. My old Starcraft has a tiled area around the heater. I used 1/2" quarry tile and all is still good after four years. You can look at my tiling techniques in the restoration thread in my signature line,
The Cowboy/HiltonModified thinset and modified grout will hold up well on wall surfaces.
Vitreous tile can be a good choice as the plastic tiles are limited in color and style choices. I know a few high-end MH mfgs use mostly glass tile for backsplashes in the galley and bath areas. Glass is shiny and shiny sells.