This s one of those "not an easy answer" questions. If the vinyl was "really" glued down. (as opposed to barely glued down) It will be hard to remove. You must have a smooth surface to do a great job. If the vinyl is smooth with no hight varations, it will take an overlay well. Uneven surfaces will bleed through. If you decide to remove the vinyl, you must clean the floor. If it ueven it will show through. You can buy coatings from Home Depot and Lowes to cover the floor before installing the overlay. Good luck with your project.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.