sweet41k
Fresno, Ca.
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Joined: 04/25/2003
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I have a 1998 Baja 24' Toyhauler that weighs approximately 7200 lbs loaded. I have a BAR-S WD hitch that worked great with my 2004 Silverado K1500 Z71 4X4 w/ tow package (7500lbs). I bought a new 2007 Silverado 1500 4X4 with the new Tow Max package (10,500 lbs). I towed my TT for the first time last weekend with my new truck and it handled horrible on dips in the road. At highway speed or even at 20-40 mph. The back end of the tow vehicle/front of TT would bounce up and down so bad that I thought the rear tires of the pickup were going to come off the ground and it would bounce 3-4 times before stopping. When setting up the WD, I made the adjustments I thought as needed. The TT sat level and the pickup was just a tad down more in the rear than the front. After reaching our destination and getting ready to return home I set the WD bars one link tighter, but couldn't measure anything due to the rough dirt roads area we were in. It didn't make any difference in the bouncing. Any ideas would be greatly appreciated?????
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Chuck&Gail
In the Colorado Mountains
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Joined: 06/16/2004
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My guess is your not even close to tight enough on WD hitch.
Chuck
Wonderful Wife
Lovely German Shepherd.
1999 Mercedes ML320 TV
2003 Wanderer 187TB Toybox (3620# UVW, 4800# loaded)
Not yet camped in Hawaii, 2 Canada Provinces, & 2 Territories.
I can't be lost because I don't care where this lovely road is going
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moorer2
Tennessee
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Joined: 02/09/2008
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I had the same problem with my 2006 1500 Silverado Z71. I had air bags installed and it reduced the bouncing quite a bit. Before I had them installed, I would loose so much momentum that the truck would struggle. It doesn't eliminate bouncing, but it greatly reduces it when the right amount of air is in the bags. Good luck.
Roy
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sweet41k
Fresno, Ca.
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Joined: 04/25/2003
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The interesting part is that the 2002 and 2004 models didn't do this at all and the 2007 model has 3000 lb more tow capacity. As far as the tension on the bars goes, they are about the same tension as when they were set on the earlier models( at least it takes about the same amount of pressure to lock them in place)
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DutchmenSport
Indiana
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Joined: 10/10/2006
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There might be a couple things going on. You might have too much weight in the back of the trailer (considering your trailer is a toy hauler) and when you go over dips, the back of the trailer, is actually lifting the front of the trailer, which in turn is lifting the entire truck up and down, causing excessive bouncing in the truck.
Or you have too much weight toward the front, its bouncing the tongue downward.
Try towing the trailer without the "toys" and see if that helps. If it does, then try to get the weight of the "toys" over the trailer axle's instead of toward the back.
Another thing. If this does not help, I'd get it checked out at the nearest GM dealer and find out of if something is not installed correctly or missing. Heavier shocks may help also. Also, if you can get the trailer weighed fully loaded, you might be overweight. Weight add up fast in a trailer. Although it might not seem like it, it really does. (Propane tanks, water, supplies, battery, then add the toys.)
DutchmenSport
2005 Chevy Silverado 3500 Dually Duramax 6.6L V8 Turbo
Century Truck Cap Commercial /Toolboxes
Northeast Outfitters Canoe
2006 Keystone Springdale Model 263DBL
Weight 4985, Carrying Capacity 2575, Hitch 560, Length 30'
Width 8', Height 10' 6"
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donn0128
Pronounced Ore-gun
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Joined: 04/21/2005
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Also check your hitch head. Could be that the angle or height on the new truck is different. Since you have a 1500, what are the tires rated for and what air pressure are you running them at?
Donn
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shaela21
Victoria, BC
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Joined: 08/12/2004
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Get rid of the stock OEM hitch for something better (Putnam V) and the bounce will be gone. Been there, done that. The OEM is bolted to the bumper, then the frame. Any bounce is not being absorbed by the WDH, it is transferred to the frame via the hitch, not allowing the WDH to do its job. I changed out mine and the bounce is practically gone.
Bob & Ang
Shaela & Duncan
2008 GMC Sierra 1500
2006 Outback 21RS
Victoria, BC
Canada "It's all good"
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mkirsch
Rochester, NY
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Joined: 04/09/2004
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"Practically gone?" "Almost eliminated?"
Those don't sound like solutions to me, then...
Isn't porpoising caused by too much tension in the WD hitch?
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Walldo
Great Falls MT
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Joined: 05/02/2007
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What is your tongue weight? Is you weight balanced inside the trailer, Replace your shocks, Chevy oem shocks sucks! Like was said earlier are your tires rated for the tongue weight, are they at max psi? Good luck, let us know what you find.
07 3500 GMC CC D/A Dually
07 3612 DS Raptor
06 VN 1600 Nomad
07 Can Am 800 Max
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BarneyS
S.E. Lower Michigan
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Joined: 10/16/2000
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mkirsch wrote:"Practically gone?" "Almost eliminated?"
Those don't sound like solutions to me, then...
Isn't porpoising caused by too much tension in the WD hitch?
No, just the opposite. Most cases of porpoising are caused by too little tension and can be cured by tightening up on the WD hitch.
Barney
2004 Sunnybrook 30FKS TT
Hensley "Arrow" 1400# hitch
2002 Ford F250 Super Duty, 7.3L PSD
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