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Old 06-28-2011, 09:13 AM   #1
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Road walking Allegro

Hi, the wife and I are new to the class A motorhome class but we think we are going to love it. We just purchased our 2002 Tiffin Allegro 34 foot motorhome and we love it however when we started
Driving down the interstate the coach seemed to road walk badly. The dealership said everything was checked out prior to us picking it up. Does anyone have suggestions on how to fix the walking problems. I have heard that air bag pressure up front may be a cause. Help please. Thanks.
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Old 06-28-2011, 09:31 AM   #2
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Is your MH on a Workhorse or a Ford chassis?

If Workhorse, is it a W-20 or W-22. The 20 and 22 refer to the Gross allowable vehicle weight,ie: W-22 = 22,000 lbs.
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Old 06-28-2011, 10:49 AM   #3
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Please define "Road Walking"
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Old 06-28-2011, 11:13 AM   #4
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If you are having a problem with wander, It is usually caused by alignment. I took many MH's to have the front end checked. The guys at the alignment shop always told me that motorhomes have to have some toe in. In other words the front tires are turned into each other. If you put them straight ahead, you wil have wander. the spec's will tell them how much, But some guys just don't follow the paperwork.
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Old 06-28-2011, 12:28 PM   #5
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Not only toe in but the caster to me is what is more important. If the toe is correct then move that caster to the most positive setting your chassis allows. It is caster that stops a vehicle from following ridges in the road or what allows you toad to stay behind you and the front wheels to stay straight. Also caster does not cause tire wear. We run+10 degrees on our race cars to keep us in a straight line.
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Old 06-28-2011, 12:53 PM   #6
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Quote:
Originally Posted by Tspivey View Post
Hi, the wife and I are new to the class A motorhome class but we think we are going to love it. We just purchased our 2002 Tiffin Allegro 34 foot motorhome and we love it however when we started
Driving down the interstate the coach seemed to road walk badly. The dealership said everything was checked out prior to us picking it up. Does anyone have suggestions on how to fix the walking problems. I have heard that air bag pressure up front may be a cause. Help please. Thanks.
You really need to provide more information than it is a 2002 Tiffin Allegro 34 ft motorhome. Tiffin made several models during 2002 and they used at least 4 different chassis. Is it gas or diesel?

First thing you need to do is check the tire pressure on any of them.

Good Luck,
Jon
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Old 07-01-2011, 05:05 PM   #7
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Fisrt things first, #1, get your on the road weight ,all 4 corners individually if possible. ARE YOU WITHIN THE ALLOWABLE GVW LIMITS OF THE COACH ?. #2 obtain the tire makers, inflation chart, and set pressures accordingly. Inspect the tires..
Are the tires in good condition ? Original to the unit ? If they are replacement tires, are they the correct load range to support the MH.?
#3 re-road test.
Is the wander condition still there ? If so ; is it the same on all road surfaces ? Concrete, pavement, smooth, groved ?
If the tires are in good shape and properly inflated,in the load rating for weight, and you have a wandering condition that is consistant on all road surfaces, you'll have to get the alignment checked/adjusted..
Also , no mention of a towed or trailer. If towing ; is the wander the same with out the trailer/towed ?
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Old 07-01-2011, 11:50 PM   #8
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You've got to check your wheelbase against the total length of the coach. On a single axle coach, if the wheelbase is less than about 53% of the total length of the coach, then you're probably going to experience 'walking' all over the highway.

The problem is usually due to the fact that the overhang behind the back axle is the same reqardless of the total length of the coach. It is usually considered that 36' is the absolute minimum coach length that will consistently handle well in all conditions.
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Old 07-02-2011, 09:47 AM   #9
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Check/correct the following before throwing money into modifications:
(1) Correct tire pressure for the weight. Get it weighed axle by axle and adjust tire pressure per the tire manufacturer's load tables.
(2) Get front end aligned properly. Ask the shop to adjust for maximum positive caster. The factory spec is a range of values, but you can request that yours be set at the extreme end of the range.
(3) If you have a Workhorse P series chassis, have the front air bags checked and pressure adjusted to about 60 psi. If you have a Ford or Workhorse W series chassis, skip this step.
(4) Adjust your driving style. Your years of driving a car has trained you to focus at a near distance, but witha big rig you need to be looking further down the road. You are probably looking close to the front to try to stay within the lines, but you will constantly over-correct if you do that. Look 50+ yards down the highway and aim between the lines in the distance. Parallax will cause you to drive straight and true.

If you still have problems after doing these things, we can discuss adding a track bar (panhard rod) to reduce sideways-tracking in the leaf spring suspension.
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