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Old 11-12-2020, 10:23 AM   #1
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wandering steering

New 2020 Coachman Sportcoach with Frieightliner chassis. On our first trip and noticed when driving down the freeway the steering does not track well. If I hold the wheel steady, it starts to drift to one side, when I correct and then hold steady it goes the other way. Seems I am always chasing the tail of the dog. Noticed it when we first picked it up, but did not think it was an issue until I had been on the road for a few hours.

Can not think that it is supposed to be like that. No other vehicle I have driven has danced around like this. Can't be good for the front tires.

Tires are correctly inflated. Is this normal? Any ideas what I need to do?

Thanks
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Old 11-12-2020, 11:16 AM   #2
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wandering steering

First, weigh the unit to determine how much weight is on the front axle.
Second, use the Internet to locate a chart for your tire size that shows how much air pressure is needed to carry that load. Adjust front tire pressure to that on the chart for your weight.

Do not use max tire pressure as shown on tire and don’t use whatever is posted on the RV.

Doing this made a huge, welcome difference in how our class c drove. I had to lower the front tire pressure by 20#’s, and was well within safe load capacity for the tires.
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Old 11-12-2020, 07:13 PM   #3
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Got weighed. By my figures I am 20 lbs over on the front and fifteen over on the rear. Stopped for the night, will adjust pressures in the morning and see what happens. Thanks for the help.
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Old 11-12-2020, 07:37 PM   #4
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Probably hard to tell on new tires, but are they wearing even? It sounds like an alignment issue with the toe in. It also sounds like maybe the steering gear is adjusted a little tight. I had that happen on a new car once.
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Old 11-12-2020, 09:45 PM   #5
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We just had our new to us 2019 Coachmen Mirada Select aligned at a truck service center. $150. It had been doing everything that you described.

Also set the air pressure to the load on my axles after we weighed it under load.

Boy, what a difference. Drives MUCH better. Tracks MUCH better.

Money well spent. Probably could use stronger sway bars, but for now....these 2 actions will work.
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Old 11-12-2020, 10:55 PM   #6
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If the unit is new, and front end alignment is found to be outside of the chassis manufacturer’s spec as delivered, Forest River may reimburse the owner for the alignment adjustment expense. That happened with me regarding a new Ford based class C alignment issue. FR reimbursed me directly for work I had done at a local truck shop. So, it may be worth contacting the regional FR customer service rep about the Freightliner’s alignment and possible coverage under warranty.
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Old 11-21-2020, 04:20 PM   #7
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In all likelihood you have too little positive caster.
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