Tow bar safety pin fell out while towing

[BGMAC]

The last trip we were on I was getting my flat tow vehicle hooked up. I went through my routine and installed the connecting pin that connects the tow bar to the vehicle. I’ve always heard to install them from the inboard out. Then install the safety pin. I did that, did my lights and break checks and we were good to go.
I drove about 200 miles before I stopped for a break at a rest area. When ready to head out I did a walk around and lo and behold I found a connecting pin missing the safety pin. I couldn’t believe the connecting pin never came out. It was fully inserted. Luckily I had a pin that would work. I’m not going to use the pins with the rounds rings that clip into place.

Oh btw, I found the fallen pin. It was laying on the running board in some mud. My tire must of kicked it up. The spring clip is what I’m using now in the pic on the left.

 

[MNC]

Lucky, could have been bad. Its good to have a routine and check things when you stop

 

[Rosy]

I was taught to insert the pins from the driver's side so there's more chance of them staying if you lose the clip because roads are crowned.

 

[BGMAC]

I was taught to insert the pins from the driver's side so there's more chance of them staying if you lose the clip because roads are crowned.

I looked that up and it was talking about the hitch receiver pin.
Here is the copy.

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Hitch Receiver Pin (RV Side)

• • The Rule: Always insert the pin from the driver's side and position the clip on the passenger side.
  • Why: The Soap Box Derby rule and towing convention dictate this so that road vibrations and off-camber roads naturally drive the pin into the vehicle rather than allowing a loose clip to cause it to fall out. [1, 2, 3]

Tow Bar Clevis Pins (Vehicle Side)

• • The Debate: Whether to insert the pin from the inside pointing out, or outside pointing in.
  • The Consensus: Place the keeper pin on the outside of the tow bar arms.
  • Why: iRV2 Forums users note that safety cable hooks can bounce and rub against the pin, potentially dislodging the safety clip if it is placed on the inside.
  • Pro Tip: Ensure that the bullnose/beveled side of the pin faces away from the arm so it locks securely in place without binding. [1, 2, 3, 4]

Could you tell me the brand of your tow bar (e.g., Blue Ox, Roadmaster, Demco) and which pin you are trying to install? I can provide the exact manufacturer-recommended orientation for your specific setup.
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I was told that when applying brakes the tow bar wants to spread or open up pushing the pins outward. I’m not sure what is really true, but the fact my pin stayed fully seated, I’ll stay with what I’m doing.