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Old 09-12-2011, 07:15 PM   #21
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Quote:
Originally Posted by David472 View Post
As the photo shows, there is a hugh difference in mechanical strength between the two.
It also shows up in the weights. The GM hitch weighs 33 lbs and the Curt weighs 54 lbs.
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Old 09-12-2011, 07:42 PM   #22
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here are a few pics of my hitch

My thought process tells me that everywhere there is rust with the paint missing , the hitch is flexing and or is a flex point? any thoughts?




I will probably head out tomorrow afternoon for weights and measures.
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Old 09-12-2011, 08:55 PM   #23
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Brian,

Reviewed your photos, and also taking into consideration member "David472" comments about his GM '07' 1500, plus a little searching, this is the conclusion I came to:

In 2007 all the 1500 models still had the 2" pin box, and the 2500/3500 models went to the 2 1/2" pin box. Also in 2007 it appears that GM removed the little metal plate in lieu of the larger 2 1/2" pin box. The 2 1/2" pin box also gave GM the ability to label it a Class V receiver, raising it's weight rating a little. But, the design and construction of the '07' OEM receiver is the same as the prior problem model year units. It should be noted that there are after-market Class V receivers with the standard 2" pin box (I have one.., Putnam).

Brian, the receiver you have "is not" the upgraded new style receiver that I was thinking of. I don't recall the model year, (2009 or 2010) but GM did redesign their 2 1/2" pin box OEM receiver, and I believe it went from a round cross tube to a square cross tube (plus, I don't think it can be removed without some cutting).

So yes, you have the design style that can be a problem, check it out closely. Referring to the prior posted GM OEM 2500HD receiver photo, check the welds that are hi-lited in yellow, these welds are noted problem areas.

Bob
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Old 09-12-2011, 09:34 PM   #24
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It appears??? in Mine & David472's pictures that the crosstubes are larger than crabman's and the pic posted with yellow hi-lights?? Regardless My hitch will be watched , measured & inspected closely!! not just now but before every trip!

Thanks for the continued interest in this!! Planning to hit the Cat scale tomorrow afternoon/evening-with pictures.
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Old 09-12-2011, 09:48 PM   #25
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It appears??? in Mine & David472's pictures that the crosstubes are larger than crabman's and the pic posted with yellow hi-lights??.....snip
Brian,

Very possible. If you want some interesting reading, just google "gm hitch failure" .
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Old 09-12-2011, 10:30 PM   #26
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Brian,

Very possible. If you want some interesting reading, just google "gm hitch failure" .
Didn't realize!! 11 pages on 1 thread @ rv.net!!
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Old 09-13-2011, 08:28 PM   #27
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Ok went to the local "CAT" scale this evening-here are some pictures of the results

Truck by itself


WD UNhitched


WD Hitched
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Old 09-13-2011, 08:34 PM   #28
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Here are some random shots of everything hitched and ready









I Think without running the numbers above in my earlier post - I see the problem - Trailer is up at the hitch!
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Old 09-13-2011, 08:51 PM   #29
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Tongue weight of loaded TT 1080# = 11.61%
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Old 09-13-2011, 09:53 PM   #30
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Tongue weight of loaded TT 1080# = 11.61%
Brian,

Great work on your CAT scale visit!

After your photo(s) post you stated: "I see the problem - Trailer is up at the hitch!"...., the only way to confirm this is to measure the TT frame distance from the ground (at front and rear of TT). Raising or lowering the ball mount will address any changes if required (TT level is ideal, or a little nose down is ok).

Your photo of your TV/TT hitched up with the Reese HP Dual Cam looks good, I don't see anything that appears to be needing any changes unless the CAT scale weights say otherwise. Good clearance with all the hardware as well (one advantage of having the TT coupler mounted to the bottom of the TT A-frame).

Tongue weight: Your correct on the Loaded tongue weight of 1,080lbs, and also correct on the 11.61% (of 9,300lbs). With the weight and length of your TT, IMO you would be wise to get your loaded tongue weight closer to at "least 13%" (1,209lbs). If it were my TV/TT combination I would be shooting closer to 15% (1,400lbs). Don't know if you can adjust your TT cargo to make the change. I'm sure that genny on the rear of the TT is robbing the weight off the tongue.

All TV/TT combinations bounce a little from time to time, the degree and/or duration of the bouncing depends on road conditions. Your genny located way out back will also influence (possibly amplify) the bounce effect, but IMO having an adequate tongue weight (closer to 15% of TT gross weight) will help in controlling/handling the same effect.

Weight Distribution: TV alone your front axle is at 3,660lbs, with TV/TT WD engaged the TV front is at 5,520lbs......: The front axle is still missing 140lbs. I would consider adding a little more ball mount tilt toward the TT (will increase spring bar force, more weight transferred), but keep the same 6-chain links under tension because your Dual Cam clearances look good as is. CAT scale has confirmed weight transfer to the TT axles as well.

TT Loaded Weight: TT GVWR is 10,250lbs, your at 9,300lbs..... looks good.

TV Axle Weights: I don't have your TV axle limits, but yours appear to be within the limits (based my 2500HD limits). As a matter of fact, your TV axle weights with the TT hitched and WD engaged, are almost the same as mine under the same conditions!! Also your TV alone gross weight is within 20lbs of mine, the biggest difference is that your loaded TT weighs about 1,000lbs more than my loaded TT.

You will have to confirm your TV's GVWR, GCWR, etc., with your CAT weights when you get a chance.

How about your receiver pin box, any flexing when engaging the WD spring bars?

Oh, please double check my math on the above data.

Again, great effort on getting your actual weights confirmed.

Bob
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