What weight capacity car ramp do I need?

Look at the GVW (gross vehicle weight) rating, not just your vehicle's curb weight, and leave a comfortable safety margin. Many of these ramps list per-pair capacities from roughly 6,500 lbs up to 13,000–20,000 lbs; a sedan owner is well served by mid-range ramps, while truck and SUV owners should size up. Because none of these listings carry independent lab verification of their stated capacities, the conservative move is to over-spec rather than buy at the edge of your vehicle's weight.