Trans jack for motor stand?

I put this bumper on my truck, it weighed around 400 lbs using a motorcycle jack.
I bolted 2"angle iron to the sides, them bolted 4X4 wood to the angles running across, braced it with a couple of 2X4, and put eyelets on 4 corners.
Worked great, considering I did it in an rough asphalt alley by myself one Sunday morning.
My neighbor came over to supervise, I told him "I got this"
he said he was just there to call 911 if needed.
He did say that it was alot more stable than what he thought it would be.

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