I just bought a used 2004 Winnebago Sightseer 30B workhorse chassis. As I drove it on the highway I struggled to keep it in one lane. I've read so much I'm now confused. The last advise was to replace my front tires and put on Michelin XZE. Please helpMarty

Check your load distribution. Most coaches handle better if the front axle is loaded close to maximum axle capacity. Empty coaches will handle different but usually a loaded coach handles better.Next you want to insure that your tire pressure is correct. This can only be determined if you weigh your coach when it is full loaded for travel and with all occupants in their seats. The adjust your tire pressure according to the Tire maker's specs. Then you need to look for worn suspension components like bad shocks, etc.

Proper tire pressure for the ACTUAL load is a starting point. Then get it aligned and be sure they set the caster at the upper limits.

Years ago I had the problem on 27' motorhome and bought wider wheels for it. That was a manufacturer who did just that. Going from 90psi in "bicycle size" tires to 50psi in wider wheels make whole World of difference.

Marty,Workhorse P or W chassis? They are very different.

wolfe10 wrote:Marty,Workhorse P or W chassis? They are very different.Yep and the W chassis isn't equipped with sway bars, if I'm not mistaken. Doesn't seem to bother some people, but many have installed after market equipment and I think that Helwig might be one company with a kit.First and before even looking into such things, one must be sure that what they have already is right with tires pressures and such, as already mentioned, but the brand of tires, would be the last thing that comes to mind.I'm thinking that 2003 might have been the end of the P chassis, so we're close here with what the OP might have and regardless for the year of the coach itself.

Wandering | Good Sam Community

427435
Explorer
Jun 22, 2015
I don't care what MH chassis the OP has. If the tire pressures aren't correct and the alignment is not correct, it will not handle well. Take care of the basics first------------then get back to us. Add-on hardware is not the basics.
wolfe10
Explorer
Jun 22, 2015
Mark,

I completely agree, the basics are THE place to start.

But, if this is a Workhorse P chassis, we need to include a mention of the OE front air bags, as many new owners are not aware of them and if not properly inflated have a really negative influence on handling (major changes in front end geometry). That is why I asked what chassis.
tatest
Explorer II
Jun 22, 2015
In 2004 the Sightseer 30B was offered on 18,000 GVWR Ford or Workhorse chassis. I think the W-16 and W-18 had not yet been introduced, so it could be either F-53 with the smaller wheels or the heaviest GVWR on the P-chassis. Each has its own handling issues.

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