My drive slants down from the garage where it would make it impossible to roll a non running car out and get it back in. I picked up a couple of heavy 15ft c channels and welded a stop on the end. Then built a couple of supports separate to set the ends on. They sit the C channels level. I can roll the car out on them then easily roll it back in. The c channels just slide back in under the car when I am done with them.