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Old 04-27-2013, 12:28 PM   #15
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Ok AirForums Community - I'm officially cornfused!


Went to local cat scales this morning. Got on platform, pressed button and told the operator I thought I needed 3 weigh ins. Not a good start. She was pretty ticked off. "can't let you do that" she said. Thankfully a trucker offered his advice to get the weights and not tick her off. So this is out of order and still incorrect but it's what I have to start with.

Picture below is 3 trips. From left to right it's the full rig with 6" of WD jack lift on the Propride. Second one is truck only (parked and disconnected the trailer). After doing the math, I called Sean as it seemed odd I was losing 200 lbs off the steer axle. He suggested another inch on the jacks and the third ticket is that weight. VERY ODD since with the additional WD applied that took 60 more lbs off the steer axle??




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Ok, next pic is my hand math of the delta on the axles based on all 3 tickets. The trucker I mentioned earlier said I'd be able to calculate the tongue wight after the first 2 trips. He didn't say how so I guessed - but my guess changed the TW after the third trip so I guess I didn't find the right formula. :-/



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I'm WIDE open to your thoughts, insights, questions and suggestions. It just doesn't make any sense to me.

A couple additional notes. One one of these trips I sat in the truck (I'm pretty sure it was the 3rd one) while the other 2 I was standing on the steer axle scale outside the truck as the operator wasn't giving me any time to adjust....

Second - the PP jacks are connected in the middle of 3 holes and I have 1000lb bars. If I connect these at the bottom hole, will that increase the push of weight to the steer axle?

Thanks muchly!!
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Old 04-27-2013, 01:22 PM   #16
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can you post pictures of your rig? side shots at a distance and a side shot of the hitch would be nice too. if the setup isn't level it will skew your setup.
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Old 04-27-2013, 01:24 PM   #17
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Quote:
Originally Posted by richinny
can you post pictures of your rig? side shots at a distance and a side shot of the hitch would be nice too. if the setup isn't level it will skew your setup.
Sure. Took this one this morning before heading out to the scales. So this is what it looks like losing 200 lbs off the steer axle (first trip across scales).

Let me see if I have some of the hitch....



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Old 04-27-2013, 01:49 PM   #18
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i'd send that picture to Sean. you may need to change the stinger height and angle a bit.
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Old 04-27-2013, 01:49 PM   #19
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Anything in particular look off to you? Will send to Sean now.
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Old 04-27-2013, 01:59 PM   #20
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don't rely on this but i think the stinger needs to tilt back more because the bar angle is getting high. even after the angle change you might need to drop the stinger down one hole. the trailer looks to be slightly nose down.

another inch up on the jacks might even things out but you might be light on the rear of the truck already.
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Old 04-27-2013, 02:08 PM   #21
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Ok - I've sent the pic to Sean. Lets see what he thinks (the guy is amazing - I feel awful bothering him on weekends but I work during the week and can only tweak this thing on weekends).

Any other thoughts on why the steer axle would LOSE 60 pounds with more WD applied? Pretty confusing! :-}
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Old 04-27-2013, 02:10 PM   #22
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One other thought richinny - if the trailer nose looks down, should the stinger come UP one hole?
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Old 04-27-2013, 02:19 PM   #23
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geometry is not my strong point so we'll wait for Sean.
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Old 04-27-2013, 02:34 PM   #24
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Quote:
Originally Posted by richinny
geometry is not my strong point so we'll wait for Sean.
Mine either!!! :-)

I've sent him the pic and a few questions.

I welcome other insights too - it's a big mystery to me as to how I'd lose an additional 60 lbs by adding an inch to the WD jacks! :huh?:
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Old 04-27-2013, 02:54 PM   #25
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SteveSueMac, is your truck a 2011 - 2013 2500HD? I changed from a 2010 2500HD to a 2012 2500HD and found that the rear spring loading had changed. The hitch on the 2012 truck sits higher than the 2010 when the truck is sitting unloaded. But, the rear springs on the 2012, with initial load, squat with less load than the 2010.

All of this is to say, when I bought the 2012 I adjusted my Propride stinger according to the unloaded truck new hitch height. I ended up with the nose of the AS sitting too low. It turned out the loaded height (with trailer attached) of the 2010 and 2012 were the same. I reset my PP stinger back to the setting I had for the 2010 and all was good.

I assume GM changed the spring loading for a softer ride in an unloaded 2500HD.

My PP stinger is set level when attached to the truck (no trailer attached) and three holes showing above the top bolt.

Hope this is helpful.
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Old 04-27-2013, 03:32 PM   #26
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Ridgerunner3 - yes, it is a 2013 and my stinger is exactly the same as yours (3 holes on top).
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Old 04-27-2013, 03:55 PM   #27
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Quote:
Originally Posted by SteveSueMac View Post
Ridgerunner3 - yes, it is a 2013 and my stinger is exactly the same as yours (3 holes on top).
I set my bar jacks at 6" like you also. My truck is a crew cab.

Do you have any close profile pictures of the hitch with the trailer attached to the truck?

The picture I attached looks like I am sitting on a slope. Just poor photography. The trailer is sitting level with the hitch setup you see.

I am sure Sean will be able to work through this with you.
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Old 04-27-2013, 04:30 PM   #28
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Question Upside down?

Am I rong, both sets of tickets look the same...

I would try.... shorten your jacks one hole. Adjust bars 'til rig looks level.
You would then have to re-weigh.

Other option....un-hitch. Measure the height of the TV thru the center of the front wheel to the edge of the fender wheel opening.(both sides should be within 1") Hitch-up measure again with no WD, then adjust your jacks 'til your back the the un-hitched measurement.
This procedure got us to within 80lbs of the CAT weights.

If you could get back to 4600lbs you should be good to go.

Bob
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