Help identify M1101 part? & brake question

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I found this on the driveway under my M1101. I re-read the TM, and I don't find it mentioned. I have no other Desert Tan vehicle, so it must have come from the M1101. What is it for? Sorry the pic is blurry.

I have 1,000 miles on the trailer, lightly loaded, and about a dozen fully loaded. I can't imagine why it fell off now.

While I have the attention of the M1101-literate, I have another question. Some trailers with surge brake s have a place where you can insert a pin to disable them, handy when you have to back the trailer up hill with a load. This pin seems light for that purpose, and I find no place for such a pin, nor mention of this in the TMs. Is there a mechanism for this in the M1101?

I did search, without any luck. Thanks.

 

[Gunzy]

Looks like a pintle lock pin. But that wouldn't be from your M1101.

 

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Looks like a pintle lock pin. But that wouldn't be from your M1101.

Thanks. I have a green M1010, which came with no pintle hitch, and no tan paint. I use a commercial ball/pintle receiver/hitch, with a chrome pintle pin on a chain. I guess this tan pin was stuck somewhere underneath the tan M1101. I can't figure where, or why it fell out now.

I didn't think I needed it, but anytime a pin falls out I start to wonder if maybe it fell from somewhere important... I couldn't see where, so I thought I'd check with the experts. Thanks!

 

[DeadParrot]

2nd the pintle lock pin thought. Looks similar to the pin on my civilian pintle hook. Maybe someone unhitched the trailer and set the pin on the trailer 'just for a moment', and as unattached parts do, it found a place to hide.