That's the thing though, they can't deal with anything other than absutely level ground - even then I wouldn't trust it. A trolley jack is fine so long as you don't try and use it on silly surfaces or with the wheels pointing the way the ground runs
I've dropped cars off the BMW foldy outy style jacks on more than one occasion (wheels still on mainly). Emergency use only for me!
I've dropped cars off the BMW foldy outy style jacks on more than one occasion (wheels still on mainly). Emergency use only for me!