Pretty much
We keep a pin tied on every wagon tongue.
It is much quicker to hook up since the tractor operator can see the wagon move and its easier for my 6 year old to hook up the wagons to the chopper or baler and saves his grandpa from having to get out of the tractor for every load.
Then just pull the rope to unhook also without getting out of the tractor obviuosly.
I don't recall what they cost we got these 15+ years ago but I want to say they where ~$100+ back then.
They make great gate latches also