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Old 05-03-2016, 10:28 AM   #1
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Andersen WDH and 32' TT : Alternative Hitches?

Hi all. I have a GMC Sierra 1500 towing a Heartland North Trail 28brs. Trailer is 32', has a 6900 GVWR and the GMC has a 11,800 tow rating. On our first trip with the Andersen hitch I was pleased with sway stability but there was some "porpoising" over bumps with the truck and trailer rocking front to rear. I'm thinking this may be due to the lack of weight transfer that is a concern with the Andersen hitch. I think I may replace the Andersen with another hitch and I am looking for suggestions. I've had good luck with the Equal-I-Zer when I had my Rockwood but I know there are newer designs out there. Thoughts?
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Old 05-03-2016, 10:35 AM   #2
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I had the same thing with my 2013 F150. I was towing a longer and heavier TT, though. I added air bags and Rancho RS9000XL shocks. Cranked the shocks all the way up when towing. It was ROCK SOLID after doing that. The Andersen is known for having problems transferring enough weight back to the front. I was using the Equalizer 4 point. I'd still try the bags and shocks- it's going to be a major improvement regardless, I think.
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Old 05-03-2016, 11:22 AM   #3
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Quote:
Originally Posted by spudston View Post
Hi all. I have a GMC Sierra 1500 towing a Heartland North Trail 28brs. Trailer is 32', has a 6900 GVWR and the GMC has a 11,800 tow rating. On our first trip with the Andersen hitch I was pleased with sway stability but there was some "porpoising" over bumps with the truck and trailer rocking front to rear. I'm thinking this may be due to the lack of weight transfer that is a concern with the Andersen hitch. I think I may replace the Andersen with another hitch and I am looking for suggestions. I've had good luck with the Equal-I-Zer when I had my Rockwood but I know there are newer designs out there. Thoughts?
any porpoising you had had do to with your TV suspension if you go to the equalizar it will just make the porpoising worse as the bars add to the effect not take away from it . having over 6500 miles with the andersen i can say it prevents porpoising and does not add to it . how good are your shocks ?
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Old 05-03-2016, 04:35 PM   #4
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With traditional spring bars (with or without integrated sway control), porpoising is typically due to being near or over the TW rating of your WDH. For this reason, I always recommend you spec the WDH kit to be at least 100 lbs over your actual or estimated loaded TW.

In this case, with the Andersen, you probably are not transferring near enough weight, and the rear suspension is taking more weight than was intended. Did you get the front wheel wells back to stock height?

Adding airbags may take care of your symptom, but if your not transferring enough weight, airbags won't help with that. I recommend you get a spring-bar-type WDH with integrated sway control (Equalizer, Dual-Cam, Blue Ox, etc).
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Old 05-03-2016, 05:21 PM   #5
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With traditional spring bars (with or without integrated sway control), porpoising is typically due to being near or over the TW rating of your WDH. For this reason, I always recommend you spec the WDH kit to be at least 100 lbs over your actual or estimated loaded TW.

In this case, with the Andersen, you probably are not transferring near enough weight, and the rear suspension is taking more weight than was intended. Did you get the front wheel wells back to stock height?

Adding airbags may take care of your symptom, but if your not transferring enough weight, airbags won't help with that. I recommend you get a spring-bar-type WDH with integrated sway control (Equalizer, Dual-Cam, Blue Ox, etc).
Front wheel wells are about 1/4" high and rear about 1.5" low. Tongue weight is 700 lb. so it is well under the Anderson's rating.
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Old 05-03-2016, 05:27 PM   #6
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any porpoising you had had do to with your TV suspension if you go to the equalizar it will just make the porpoising worse as the bars add to the effect not take away from it . having over 6500 miles with the andersen i can say it prevents porpoising and does not add to it . how good are your shocks ?
The truck has only 2400 miles so the shocks are new. When I was using the Equal-I-Zer I towed a Rockwood 2601 (29') with a Yukon and did not have this problem. The Yukon did have HD shocks and Timbrens but my current truck has a much longer wheelbase.
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Old 05-03-2016, 06:32 PM   #7
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I added air bags to my setup and with max tire pressure, I don't get porpoising anymore with my Andersen. My tw is about the same as yours with gas and the batteries.
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Old 05-04-2016, 12:04 AM   #8
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I added super springs in the rear to stiffen things up as I felt like i had too much movement. Talk to the people there- very nice and had more options for me than I would expect. Went with sumosprings in rear and my drive ability improved from not moving as much. Very happy.


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Old 05-04-2016, 01:15 AM   #9
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Tighten the Andersen compression bushings more. How many threads can you see? I ran at 5-6 showing in smooth roads but would often pull over and crank them down a thread or two to compensate rough roads or windy days.
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Old 05-04-2016, 08:58 AM   #10
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The truck has only 2400 miles so the shocks are new. When I was using the Equal-I-Zer I towed a Rockwood 2601 (29') with a Yukon and did not have this problem. The Yukon did have HD shocks and Timbrens but my current truck has a much longer wheelbase.
Age of shocks has nothing to do with it. Stock shocks are designed primarily for a soft ride. The Rancho RS9000XL's are adjustable so you can crank them up to be much stiffer when towing but then back down for a plush ride when unloaded. There are options other than air bags, just keep in mind that none of the others will allow you to adjust ride height. I prefer bags because I can actually raise the truck back to whatever height I want. The other systems require compression of the rear suspension to engage.
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