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Old 01-14-2011, 10:05 PM   #169
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Your work is appreciated Andy.
Thank you,
Robert
Thank you.

Andy
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Old 01-14-2011, 10:32 PM   #170
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This works for chain based hitches that are more or less static - does it hold true for ProPride or Hensleys where the bars are more dialed in to raise the vehicle, thus even with 1,000 pound bars you may only be using 700 lbs of force to level the vehicle?
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Old 01-15-2011, 08:27 AM   #171
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This works for chain based hitches that are more or less static - does it hold true for ProPride or Hensleys where the bars are more dialed in to raise the vehicle, thus even with 1,000 pound bars you may only be using 700 lbs of force to level the vehicle?
We, obviously, don't have data for those setups, but the principles are the same. But do the springs behave more like an equalizer or something else. We don't know. My concern is not so much driving down the road as it is hitting those entry/exit driveway aprons and really flexing the bars. You can see on the graph how dramatically the forces climb.

I know Andy states that heavy bars transmit a huge amount of shock while driving over expansion joints, patches, etc. but I think more of the shock is transmitted through the ball and coupler, since this is a "solid" connection under not only the tongue weight, but also pressure exerted by the spring bars.....and there is the relationship of bar stiffness and shock transmission. BUT, say there is 1400# of force on the ball (TW + clamping force). How much does it matter if that force is applied by a 600# bar or a 1000# bar. Certainly, the 600# bar will have more flexibility, but does that make a dramatic difference in shock transmission through the ball? I don't know, but I think it is not as big a deal as some think. I am in the camp that believes rivet snaps etc. are the result of excessive torques and twists from stiff bars and traversing larger undulations in pavement....or especially unimproved roads.
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Old 01-15-2011, 08:27 AM   #172
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This works for chain based hitches that are more or less static - does it hold true for ProPride or Hensleys where the bars are more dialed in to raise the vehicle, thus even with 1,000 pound bars you may only be using 700 lbs of force to level the vehicle?
Good question.

We did not test those brands.

Perhaps some others might invest some time and money to do it.

We tested the most commonly used brands and ratings.

Andy
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Old 01-15-2011, 11:50 AM   #173
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Andy,

I really want to thank you for your continued support and participation in supporting the Airstream members here on our forums!

I believe your posts, studies and years spent in the insurance industry have not only educated many of us, but more importantly, you continue to spark conversation and discussions that keep us all on our toes!
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Old 01-15-2011, 12:06 PM   #174
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Andy,

I really want to thank you for your continued support and participation in supporting the Airstream members here on our forums!

I believe your posts, studies and years spent in the insurance industry have not only educated many of us, but more importantly, you continue to spark conversation and discussions that keep us all on our toes!
I think John that the large majority of us feel the same way and your post says it a lot better than I could have put it. We may not always agree with results regardless of who posts them, but it is more information for us to ingest and assimilate for our own use. Andy continues to support the forums, events, and shares his knowledge. It is appreciated.
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Old 08-05-2011, 09:33 AM   #175
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Smile Thanks for the help.

I appreciate the work by Andy and the comments. Monday I pick up my new 2008 Safari SE 27FB which I will tow with a 2011 Ford F250 Diesel. The owner is including a Reese Dual Cam with 1200 lb bars. Thanks to the information on this and other threads I'm switching to 800 lb bars and having the Airstream dealer near the soon to be prior owner (Colonial) look over and adjust everything.

These forums are a great source of information for wanabees and newbies. I've been a member for almost a year and read the portal almost every day. The many discussions have helped me in both selecting and evaluating my new acquisition as well as making my wife and I excited we will next week be joining the Airstream community.
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