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Old 07-05-2014, 08:33 PM   #1
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Newmar Owners Tow with a Medium Duty Truck

Hello fellow Newmar owners. I am looking at moving up to a Medium Duty Truck. But I have run into something a bit disturbing from a medium duty TV owner this evening. Granted he wasn't pulling a Newmar 5th wheel. But he did have a Carriage Carri-lite (5 slide model). Anyway pulling with the medium duty he had to reinforce and brace the pin box area of the 5th wheel. The rigidity of the medium duty caused the pin box and area over the truck to start breaking welds and a lot of other structural issues. I don't see this being a problem with a Newmar. As I believe the build is superior over most 5th wheels. My question is has anyone run into Pin box issues in regards to structural strength of there Newmar. I do think the move to the MDT is a plus and its safer. But will it cause the issues I described on my Kountry Aire 39RKWB. Curious to hear opinions. i will be using a 4 way pivot 20K husky hitch in the new truck. I use the same hitch in my 1 ton 3500 dually right now....But its a beast of a 5th wheel for my 3500.
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Old 07-05-2014, 09:04 PM   #2
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Most of the people I see towing Newmar 5ers are using medium duty trucks. I don't think your going to have a problem.
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Old 07-05-2014, 09:06 PM   #3
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didn't really think it would be an issue. After seeing what happen to this carriage I had to ask!
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Old 07-05-2014, 09:08 PM   #4
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look at the many models of air ride hitches ,I use a 'trailersaver'.
Air ride rear axle is a device to maintain driveline angle- not soft riding in fact quite the opposite it is valved to maintain ride height - rigidly
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Old 07-05-2014, 09:11 PM   #5
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And yes it is a 'issue' every HDT I see has either a air ride hitch or air ride pin box.
The air hitches out number the pin boxes about two to one
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Old 07-05-2014, 09:20 PM   #6
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the truck and trailer that had the issue was a 5500 Chevrolet. I am going to end up with a 4500 I do believe. Hopefully not sprung as stiff as the 5500. Air ride hitch seems to be the way to go. Thank you so much for the opinions and experience.
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Old 07-06-2014, 05:52 AM   #7
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In that case you should be ok ,however if you can afford the cost they (air ride hitch) are well worth it in your comfort and trailer contents remaining in place.
True story;wife left 2 eggs on fridge shelf (long story in itself) when we left Tennessee this spring ,they were in place and intact 12 hour drive later ,I75 to Detroit/Windsor border .
Was it because of the air ride hitch?
It must of helped.

P.S> a 4500(class3-4) is not generaly referred to as a MDT
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Old 07-06-2014, 10:57 AM   #8
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4500 Chevrolet (GVW 19,500) is the same size as the 5500 series. Its still that bigger truck. Much bigger then the 1 ton (3500's) My Kountry Aire has 2970 on the pin as rated in the manual from Newmar. Add Onan generator, 75 gallons of water and full time stuff in the underbelly storage. I figure 3300-3500 is what the actual pin is right now. I am hoping or thinking that will be enough weight to compress the springs enough to take some harshness out of the ride. It will tame the springs on my 3500 for sure.
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Old 07-06-2014, 05:07 PM   #9
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As I stated in another of your threads my pin weight actual is 4040# trailer 16000# and a bit.(CAT scale)
get it weighed and don't kid yourself these things are very heavy.
MDT trucks are bigger then 4500/5500 IMO, look up freightliner M2 for example,
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Old 07-06-2014, 06:10 PM   #10
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F450 vs. 4500 with pics - LawnSite.com™ - Lawn Care & Landscaping Business Forum, Discuss News & Reviews

In the link above is the comparison pic of the F450 and 4500. The F450 looks like a 1ton with a little bigger tires. The 4500 looks more like a MDT.

There is a bit of GVW difference in the M2 and the 4500....26K versus 19.5K....But there is also a 60K diff in price even used. The 4500 will fill the need and handle the weight of what I am going to put on its back. Now that I know I need an air ride hitch or pin box I will go in that direction. In the mean time I may contact Newmar and see what they have to say. See if they recommend both or air on one side only.
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Old 07-06-2014, 09:59 PM   #11
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Do yourself a favour and google rvhaulers ,mine was $50,000 all in.
465 hp and 1650 ft lbs same footprint as a long bed dually.
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Old 07-07-2014, 03:13 PM   #12
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I see your 670 Volvo in your signature. Thats a nice truck. Thanks for all the info.
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