You can find the gvw on your driver's door sticker or owner's manual. The ramp's rating should be well above your car's gvw, to allow for a margin of error or a front-heavy car.
[header] How to use car ramps [title] Check the maximum rated load. [step] This is the most important characteristic of your ramp: the larger this number, the safer you'll be. The ramp's rating refers to the maximum gross vehicle weight (gvw) that can be driven onto the ramp.