Forum Discussion

Supercharged111's avatar
Feb 02, 2018

Some n00b Questions: tie downs, shocks, swaybars, etc.

I just bought a 2007 Lance 1131 and put it in the back of my 1997 GMC K3500 crew cab dually. With just airbags, the truck drives better than I thought it would. I was worried the air pressure would raise it up off the overloads, but it didn't. The truck rides nice and firm, I expected it to be much more wallowy. It does, understandably, lean a bit in the corners.

First question is tie downs, specifically the turnbuckles. I used 4 long body Happijacs to tie the camper to my Torklift frame mounted tie downs. According to the link below, I'm using 4 fronts and causing some excessive porpoising. The porpoising has been my main complaint thus far, and until now I had blamed on on the sheer length and mass of the camper. Are those front shocks that tie into the wiper cowl worth a ****? The guy at the Lance dealer had indicated that they like to snap off as soon as you leave the pavement.

https://www.truckcampermagazine.com/camper-tech/maintenance/ask-the-expert-maintaining-happijac-tie-downs-and-turnbuckles/

Next question is shocks. I'm fairly torn among Bilstein 4600, Bilstein 5100 (with their "digressive" valving, whatever that is), and Rancho 9000. Adjustable shocks are great, but what's their usable range? Is their stiffest stiffer than the Bilsteins? Will they last half as long? I've not seen much good about the longevity of Rancho shocks.

Last question is swaybars: do they make any difference with that ginormous of a camper sitting that high up? Is Hellwig the only game in town for my old dually? Should I add just the rear without upgrading the front? I understand the shift in balance it will cause empty to do just the rear, not concerned about that, but if upgrading the front helps I'm willing to do it. I mean I figure it has to have some say, the frame does tie it all together.
  • The Hellwig rear bar for my truck is 1 1/8". Is that smaller than what you guys have? I'd like to find the biggest one I can but so far all I see for me is Hellwig.
  • Thanks Jim, mine bounces around like in the video. It seemed excessive to me, but I guess it's the norm.
  • If you do not have a rear sway bar, get one, made a great difference on our CC drw.
  • What's the concensus on those front shocks that Lance offers? Seems like a great place to get some leverage on the camper body to control movement. There's just so much camper in front of and behind the 4 mounts I have now. . .
  • Some movement of the TC is normal. You don't need a compressor to get rid of the T.

    If the turnbuckles are loosening, they probably are not tight enough.
  • The truck itself isn't porpoising, the camper is on the bed. Rear bushings were replaced last year but with rubber. Tires are 65psi up front and about 72psi out back. Tie downs keep working loose somehow and it's really bugging me. That's what set me on the path to looking up how to maintain them and I noticed in that link above that I may just need to source the correct rubber/non-sprung rears to fix that issue. Below is a quote from that article:

    In place of the linear compression spring that is in the front turnbuckle, there are rubber bushings inside the rear turnbuckles. Having springs in all four turnbuckles promotes porpoising, a front to back rocking or hopping that happens when traveling at speed or on uneven and undulating highways.

    I am using a T in my airbags and my neighbor told me exactly what you're saying towpro. Since I don't have a controller for them, I may just open my wallet for a compressor setup that manages the bags individually. The bags themselves are brand new Airlift units.

    I'm glad to hear the swaybar makes a difference. Have either of you also swapped the front? I intend to swap my single upper overload spring for the triple setup that GM offered on the cab and chassis trucks (not the HD version) back then. It will allow me to be less bag dependent and not affect my empty ride. I was pleasantly surprised to find that my truck wasn't that far off of how I wanted it to drive the day I brought the thing home. Duallies kick ass.
  • I am lead to believe the bilstein 4600 is the shock with correct full extended length for the given application, and the 5100 is 1" longer extended. but both have same valving.

    Many like the Rancho 9000's, but have problems with the adjuster seizing up.
    I tried them on the back of my new Ram and I felt they were worse loaded than factory shocks (truck was brand new). they sent a set of replacements but they were the same so they took them back and I have been happy with stock. If I later decide to change shocks (only 14000 miles on it now) I will go with Bilsten 4600.

    I did add a Big Wig sway bar to back of my Ram. I had sway bar before I bought my current camper so I can't tell you about the difference.

    I did find on my Ram that even though 65psi is correct pressure for my weight on rear tires, I raised that to 70 and he helped with the ride.

    you really need to put your truck with camper loaded on a scale to see what your weight is.

    are you using an air line for each air bag? if you have one line for both bags with a "T" in it, air will transfer from bag to bag as you go around a corner.
  • Porpoising is a front to rear balance issue. I'd take it to a scale and see where you are compared to the tire pressures, first.

    With a 97, I'd replace all of the bushings for suspension/bed with urethane. You don't mention the tire pressure, but that along with shocks can make a big difference. I had Rancho 9000s on my previous SRW, but I think the Bilstein 4600s on my current truck are better riding.

    I don't know who makes a sway bar for your truck, but others have noted that it makes a big difference. My F450 already has a very heavy suspension, so I didn't replace the sway bar on my truck, and it didn't seem my previous truck a SRW needed it either. They were both Fords, however.

    Finally, check the tightness of the tiedowns since that can make a difference. Don't overtighten, but make sure they are tight enough.