All over the road

Glad that worked! As soon as you can though, get your rig weighed...preferably a 4-corner weight, but if not... at a minimum, both axles separate. THEN set the tire pressures according to the weight chart for your tires. Weigh the rig with everything, including passengers and pets, you would normally carry on a trip...full fuel tank, water, clothes, food, ice, beverage, etc.

Today I went over and set all air pressures to 80 PSI on the tires. They had been set at one time at 90-95 PSI, or so I thought.

I then took the unit out to a variety of roads with slopes to them and it tracks better and does not "hunt" anymore.

It would appear that I had too much pressure in the tires and that was the sole reason it handled funny.
Problem solved anyway, and a cheap fix at that. I still cannot believe that tire pressure could cause all those problems.

Thanks for all the suggestions.

The longer distance from the front axle to the rear will be a huge difference in the white knuckles you might be having. Do the research

I am going to try lower pressure tomorrow and see what affect it has.
Also note that I removed the old CRT style TV and all associated electronics and the rear passenger chair from this unit which lowered the front axle weight by an estimated 350-400#, Not much but it all counts.
This unit has a large water tank in the middle of the chassis, 75 gallons worth, and I never travel with it full unless I am dry camping which would be rare for me today. No sense in carrying weight you don't need.
I am in contact with a member of the forum that is very helpful with lots of experience with tires.
I do have Ironman tires, like new. size 245/70R 19.5.
The federal label inside the coach says max pressure on both axles is supposed to be 85 PSI and I am loaded medium weight, I think.
When I measure the pressure on the front I found that the pressure was over that recommended at 90.
So tomorrow I will lower the pressure and even them all out and take a test drive.
Somehow or the other I had in mind that the pressure was supposed to be at 95 PSI, maybe from what the dealer told me when I got it, and they could well have been wrong.
Anyway, I will check all the pressures all around and level them out at 75 as a starting point and see how it drives.
From there I will have someone experienced check the suspension for wear and possibly have some new shocks put on it.
Hopefully this will be a cheaper fix to the problems.
Thanks.

Lower the tire pressure and put as much weight near the front axle as you can. Also keep the water tank half full or less.

Interesting to see the number of hams here. Me too, W7KKK, just getting active again after getting clearance for RF exposure and my pacemaker/defibrillator.
If it's not one thing it's another.

Something we forget in these days of Independent Front Suspension and McPherson Struts is WAG

Your motor hone is on leaf spring spsennsion this means the body can mnove (Slightly) side to side relative to the axle .So imagine if the front moves left and the rear right, You think you are wantering toward the center so you compensate, then the ends swap How you think you hare headed to the ditch and you conmpensate. Like a dogs tail waging side to side.

Another issue is sway.. Like fans at a rock concert swaying side to side holding their bics

Three improvements you can make on MANY motor homes 2 on most all

1 Sway bar, Helps control the Rock Fan like side to side rocking.

2: Trac bars Front and rear two of them stop WAD dead I mneanb 100%.. One is often enough Most folks say do the rear firest

3: Steering stablizer I went with Blue Ox Tru-Center as when I got it it was the only one you can "Re-center" from the drivers seat Now Safe-T-Steer offers tha as an option,

Years ago had a Bounder. Same problem. The rear overhang contributed to the problem. Added steering stabilizers. Helped a bit but could not solve problem in any medium to high side winds.

I had the same thing when I went to the max pressure on the tire. Once I adjusted it back to the "calculated" weight it handled much better. I was riding on the center of the fronts and this was causing it to "hunt" while rolling down the road

You need to weigh your vehicle. Then consult tire chart for proper front and rear tire pressures. I run slightly higher then chart shows for my weights. Only about 5 pounds.