vibration

Around here the birds like to hang out underneath my vehicles. It's shady and lots of places to hide under there.

If you're still having vibrations and your tires/wheels aren't the issue, possibly the driveshaft may be out of balance or have a worn u-joint or carrier bearing.

Triker33 wrote:
Going 65-70 MPH in first gear is too fast. You should let the transmission up shift a couple gears. :)

Why you say that.
I've never say it was on first gear

I had some (OK, a lot) of vibration around 65-70 on my last trip. Obviously something was out of balance.

I ordered and installed a set of Centramatic balancers--quite possibly overkill, but I hope to keep the motorhome for a long time, and all the reports are they work well.

While installing them, I discovered that I had the remains of a bird (yes, a bird) smashed around the inside of the right rear inner wheel, between the wheel rim and the brakes. How it got there I have no idea; maybe it though that a nice protected spot to start building a nest or something. Probably that was the cause of the out of balance wheel.

At any rate, after cleaning it out and installing the balancers, it's much, much better...and I can look forward to continued smooth riding.

Also. Something else to think about. IF you are still having some vibration in the first 70 miles. "Some" tires develop a "flat" spot when setting over night, or for a few weeks, and if your MH is sitting for a while. That could be part of the problem.
Of course after they warm up the "flat" spot works out, and the vibration goes away.

Going 65-70 MPH in first gear is too fast. You should let the transmission up shift a couple gears. :)

Good on You AND the Shop!

Hard to find a shop that knows how to solve problems. Most just want to make a big sale or make a snap judgement fix without digging into what's really going on.

Besides, unless that bad tire was made with a lump in it, that's always been there, something in there was getting ready to fly apart and it's great you caught it now.