The dogs hate this ramp and I hate it almost as much.  Good concept, but bad in practice.  The hard surface and light bounce have the dogs scampering across it and they both attempt to jump off the side rather than walk up or down this ramp.  We have 100+ lb. dogs.  The ramp is also heavy and awkward to lift in and out of the car.  We've pinched our fingers more than once moving the unit.  And the unit is quite large taking up a lot of space in the back of the wagon.  For the price, I don't recommend.  Spend more and buy folding stairs.  I finally broke down and spent the money and the dogs are thrilled. Zero learning curve.  They go up and down without issue and the stairs are lighter and take up much less space in the vehicle.