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Old 09-11-2013, 08:59 AM   #71
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1986 34' Limited
1966 24' Tradewind
Conifer , Colorado
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Hello dezFOg,

Thanks for posting the results of your experiment. Yes, I agree the towing forces ought to be taken by the square members of our draw bar and receiver. On my tow vehicle, I have too much slop, and the pin gets a lot of the load. When I hand lift my stringer, my pin does not rotate. When I twist my stringer, the pin does not rotate.

I will get a 2.5 inch square draw bar from Propride eliminating the sloppy reducer sleeve. And I will shim or clamp the draw bar to the receiver eliminating as much free play as possible. And I might make a precision hitch pin out of tool steel that is about .660 in diameter taking further slop out of my hitch assembly.

I want the square members to take the load.

I read with interest the thread about the swaying car dolly in this forum and all the movement noted in the hitch. These things are built sloppy.

David
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Old 07-11-2014, 06:19 PM   #72
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1986 34' Limited
1966 24' Tradewind
Conifer , Colorado
Join Date: Jun 2009
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Less Slop

We just made our first trip since I modified my hitch drawbar. I was concerned about the loads on my hitch pin. My pin that came with my tow vehicle was bent quite a bit. I attributed this deflection to all the slop in my Cat V 2.5" square receiver to my 2" square drawbar.

Last winter I welded the reducer sleeve to my ProPride drawbar (shank?) (stinger?). The Curt reducer sleeve I used had a good 2.5" square measurement. Some of them measure smaller. The one from Ford certainly did.

Now there is much less slop when I insert the drawbar into the receiver. When I connect my Airstream and crank up the WD bars, I can still move the hitch pin. Almost all the vertical and rotational movements are absorbed by the squares, not the pin.

This gives me much more confidence as I enter ramped driveways from an angle and put a bunch of load on my receiver. I got here in Denver with very little witness marks on my new pin.

Problem solved. Those Airstreamers who have Cat V 2.5" receivers on their trucks ought to be cautious with vertical and rotational slop with a reducer sleeve and 2" drawbar pined to the receiver.

David
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