Automatic tire chains

[machines]

Has anyone made or know of someone who made, their own automatic tire chains, like the on-spot or insta-chain or roto-grip systems?

https://www.onspot.com/en-US/

Home | Insta-Chain | Automatic Ice Chains

https://www.rudchainusa.com/rotogrip-about


These systems are quite pricey and look deceptively simple.

I would think it would take a lot of trial and error to make it fit and work right.
Would be nice to be able to copy a successful unit.

TIA

[exester]

But it seems that it needs a certain speed to start working, Starting uphill on a slippery road still won work. So nice idea but needs a lot of improvement before I'll buy it.

[hemmjo]

I have never seen them in action, but I see them hanging under most of the fire trucks around this area. Not sure which brand. Some school buses have them also.