We cannot lift our camper on our rounded curb because the sidewalk is very high (old road, many times paved) and our gutter is very low. This allowed the camper to be pulled over the curb but had to be attached to a 2x4 and then used with other 2x4s for the 'front' and 'rear' ramp. Expensive but very strong and durable, it can easily handle our 2000+ lb RV and full size Dodge Ram Charger. If you need to negotiate a curb, this is the key! See photos from other reviewers for the 2x4 trick and adapt it to your needs.