It's not the tarp that you have to worry about. It's where the tarp touches the edge of the rubber roof where the roof laps over the side of the RV. It is the major location for chafing on a rubber roof. This is a problem for all RV covers - even those covers that are designed for RVs.
The action of the wind lifting and lowering the cover (tarp) - even just a little bit - causes friction against the edge of the roof over time. This will wear away the rubber roof where the friction occurs.
Have patching material on hand and inspect the roof for wear every time you remove the cover.
