Landing gear

Not that I know of, I just pay the biggest "lug" in the yard $20 to crank the handle for me.

 

How about a nut with a hole drilled all the way through then cut off a bolt a size smaller than the hole and trim it just long enough that it doesn't stick out the end of the nut? Or if you used a big enough nut you could countersink the head of the bolt to keep it in place while you put the socket on.

 

If the nut before you had raised it properly you would not need a nut to fix what the nut did!

 

That might only be practical in a dedicated trailer application where you never changed trailers, and always wanted to hassle with the air hoses and such. Having to R&R the crank handle would be time consuming, and all trailer landing gear systems have a high and low speed, and it's generally not an issue time-wise or physically-wise, even for weaker individuals.

Just can't imagine where such a "tool" would be practical unless you simply lost the handle and had nothing else.

 

For situations like that I have 4x4 blocks about 18" long. Get your tractor frame rails under the trailer,may have to dump air depending on how low.
Dump bags,place blocks on rails then raise suspension

 

You can also use the wood like a ramp.