Just seen this on Facebook. This would save some time on track days!! https://www.facebook.com/groups/468886476574282/permalink/691536607642600/
Nice but you should see the BTCC ones they shoot up in the blink of an eye. would be fantastic for taking the weight off the suspension during winter storage though.
Those jacks are only slow as they're being run of a tyre as opposed a canister. Run it off a bottle and up it would go. Id love to see the welding job done to mount them AirJacks can be had quite cheaply but you have to chop the chassis to install.