extreme single-side tire wear and front suspension questions
I have a 1996 National Tropi-Cal 235 (Chevrolet 454 SFI, P Series motorhome chassis with tag axle) with 80k miles. My problem is extreme single-side tire wear on the driver side front and to a lesser degree the passenger side. I was checking the rig over and noticed the front driver tire has worn into the steel belts (!) on the inside tread, but the outside has plenty of tread. The passenger side tire has slight inside tire wear compared to the rest of the tread. I installed new tires all around in 2009 (Goodyear G670 RV 225/70R19.5) and have driven them approximately 12k miles. I replaced the bad tire and drove 60 miles to large truck tire & alignment shop for alignment. They said it needed ball joints, but reluctant to repair as no previous experience with type of suspension on my Tropi. Called a RV dealer who suggested I contact Chevy dealer who works on heavy trucks (& workhorse motorhomes?). What a logical suggestion...why didn't I think of that? Another 60 mile drive in different direction and $130 to diagnose. Told me it needs everything...ball joints, tie rods, air bags, steering damper, etc....and only $5,000 for parts & labor (ouch!).
Hard for me to believe my 80k mile rig needs everything replaced. I wonder how common this is for P Series motorhome chassis. Has anyone else needed to replace most/all of the frontend on their National?