[BitWielder1]

I think this actually happened a few years ago, but it was a Cessna, not a large traffic liner.
An empty 737 weighs over 30 tonnes (according to one web site, it seems a bit low), enough to blow out the tires on the truck even if (if!) the suspension would hold up.

[Calvin Locke]

I think this actually happened a few years ago, but it was a Cessna, not a large traffic liner.

And, iirc, a mechanic stood up through a sun roof of an auto to work the gear to extend fully and lock.

Excellent coordination by all involved...

[GBA]

I have a vague memory of an incident with a Piper Cherokee variation, a Saratoga, I think, where one of the mains didn’t extend and a guy in the back of a pick up truck that was driving down the runway under the plane was able to reach up and pull the reluctant gear down and locked.