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> Too much rocking back and forth when hitting bumps, How do I stop the front to back rocking

Fandini
post Oct 1 2017, 12:11 PM
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Joined: 1-October 17
Member No.: 9,801
Favorite Truck Camper(s): Artic Fox
Type and Brand of Truck(s) Owned: Ram 3500 4x4 Crew Cab LB
Type of Tiedowns used: Forklift with fastguns
Truck and Camper Setup: Ram 3500 w/ firestone airbags Artic Fox 990 w/Cummins Onan 2500 on board gen



Alrighty. New to the site and 2 weeks into the truck camper scene. Had a great experience with the dealer who was honest and guided me into the right directions for things and add on to the truck and did not try to sell me more than I might need. I have a 2017 Ram 3500 4x4 Crew Cab long bed single rear wheel with an Artic Fox 990 camper and firestone airbags added. I'm using Torklift Fastguns tie downs. I'm getting a lot of rocking of the camper in a front to back direction when going over bumps down the road and if the road is really bumpy the over cab portion of the camper almost seems to hit the top of the cab. The fast guns were set and labeled by the dealer and I feel they know what they're doing. Still...... I feel like I'm on the end of a bungee cord when driving getting jerked front to back. When going off road, beach driving mostly, I'm worried something may get damaged. Can somebody give me some advice on stopping this excessive rocking chair style of motion of the camper?
Thanks
Bill
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Chief 2
post Oct 2 2017, 05:49 AM
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Group: Members
Posts: 33
Joined: 19-March 17
Member No.: 9,469
Favorite Truck Camper(s): Lance
Type and Brand of Truck(s) Owned: 2005 Chevrolet 3500 4x4
Type of Tiedowns used: Happijac with Quick Loads
Truck and Camper Setup: 2005 Chevy 3500 4x4 Edge Attitude, 4" exhaust, Airaid Air Intake, Ranchos, Air Bags, Hellwig Big Wig, Cabover struts. Lance 1172 loaded with 200 watt Renogy solar and Zamp controller



It is called porposing. What pressure do you have your bags set at? To high could be part of the problem. On my Lance I have the front struts that are a huge help with eliminating it. I believe that Lance is the only company that uses them though. Sorry I can't give you anymore advice on the problem.
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Fandini
post Oct 2 2017, 09:55 PM
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Group: Members
Posts: 2
Joined: 1-October 17
Member No.: 9,801
Favorite Truck Camper(s): Artic Fox
Type and Brand of Truck(s) Owned: Ram 3500 4x4 Crew Cab LB
Type of Tiedowns used: Forklift with fastguns
Truck and Camper Setup: Ram 3500 w/ firestone airbags Artic Fox 990 w/Cummins Onan 2500 on board gen



QUOTE(Chief 2 @ Oct 2 2017, 05:49 AM)
It is called porposing. What pressure do you have your bags set at? To high could be part of the problem. On my Lance I have the front struts that are a huge help with eliminating it. I believe that Lance is the only company that uses them though. Sorry I can't give you anymore advice on the problem.
*



I started with 50 lbs in the air bags but pumped them up to about 70 to stiffen the rear to counteract body roll. I don’t really think there was any difference in the camper unit porposing between the 2 different air bag settings but I can only try it at 50 lbs again and see. I will be adding a Helwig sway bar for the body roll later on.
Thanks
Bill
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SidecarFlip
post Oct 4 2017, 09:36 PM
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Joined: 15-October 16
Member No.: 9,221
Favorite Truck Camper(s): Forest River Palomino SS
Type and Brand of Truck(s) Owned: 1997 Ford F350 4x4 LB SRW CC 7.3 diesel
Type of Tiedowns used: HappyJac standard
Truck and Camper Setup: 1997 Ford F350 4 door 4x4 Crew Cab 7.3 Diesel, Lance 915 loaded, 2015 Palomino SS1500 Loaded



QUOTE(Fandini @ Oct 2 2017, 09:55 PM)
I started with 50 lbs in the air bags but pumped them up to about 70 to stiffen the rear to counteract body roll. I don’t really think there was any difference in the camper unit porposing between the 2 different air bag settings but I can only try it at 50 lbs again and see. I will be adding a Helwig sway bar for the body roll later on.
Thanks
Bill
*



When I had my Lance 918 (which was a tank), I ran my bags at 40 pounds maximum and I ran Rancho RS 9000 shocks in the front and rear with a factory sway bars front and rear.. I've since switched campers and shocks I have a lighter camper now (Palomino SS1500) which weighs about 2500 wet. I run 30 in the rear bags maximum. I went to SkyJacker Monotube Black Max shocks. You never want to run a pressurized nitrogen shock on a truck, always a conventional hydraulic dampened shock, preferrably with strong rebound damping.

Porposing is caused by a couple things, The Cg can be too far back which can be corrected by loading the unit with your heavier gear farther forward (so long as the camper is loaded as far forward as possible, that is, not having a unit for an 8 foot box loaded in a 6.5 foot box (that puts the Cg back and causes handling issues, Too much air in the bags causing the weight to transfer to the front axle abruptly on throttle changes or a swoopy road and having too much air in the bags causing the truck to sit un-level.

You only want enough air in the bags to level the truck and no more.

Even when I pull my tri axle gooseneck overloaded with round hay bales, I never run over 60 psi in the bags, only enough to level the truck and no more.

One, I think you have too much air in your bags.
Two, your front shocks (and possible rear shocks) need changed to a conventional hydraulic mono tube shock, Rancho, SkyJacker or whatever you prefer but no gas charged shocks. Only conventional
Three. Your Cg May be too far back and if it is, load the front of the camper with heavier stuff and keep your black and grey tanks as close to empty as possible.

I think a shock replacement and lowering your pressure will do the trick.
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Freespool
post Dec 9 2017, 12:39 PM
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Member No.: 8,975
Favorite Truck Camper(s): Still deciding
Type and Brand of Truck(s) Owned: 2016 GMC3500dualyy4x4diesel
Type of Tiedowns used: Torklift with Fastguns
Truck and Camper Setup: The plan will utilize a 3500 GMC with a 11 or 12' TC with a full compliment of Torklift hitch components and tie downs. Stable loads if needed will be installed.



I recently read an article provided by Truck Camper Magazine where they were testing front struts on a Lance. Back in the day these were commonly used but nowadays not so much. Lance is the only builder still endorsing them according to the article. I think the above tips will be your best remedy but the addition of the struts may provide a little more help. The article is interesting and provides both the pro's and con's of the product. The overall opinion of the product was mostly positive. Good luck
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