An easy project,i think I'll do one someday and these farm jacks are easy to get...
"Farm Jacks" or even the branded types like Jackall & Hi Lift are horrible things and should only be used to lift a vehicle when there is no other, better, alternative. Google 4x4 sites and you will see what a reputation they have for suddenly giving way and dropping the load to the floor. I've had it happen myself - and it took the end of a finger off at the same time.
The thought of that type of vehicle ramp horrifies me. Once stationary no problem but when lowering that is normally the time they collapse.
http://www.youtube.com/watch?v=UamsadYk25s
http://www.youtube.com/watch?v=TzPUZM7Y2N4
Paul H
Absolutely,horrible dangerous things on their own,Ive see one slip!These lifts have them attached ,so theres no way of them slipping.
May I suggest that since there is a demand for a decent car ramp for DIY use, we shall make it a "forum's project" and every one that can and will contribute
knowledge/experience and wi'll come up with something that all of us can build and make use of?