Tire pressure

5 pounds will not make much of a difference.
You should get the vehicle weighed. What chassis? Are the air bags front or back?
Are they factory or after-market?

What does the door sticker say? That's generally the pressure required for the maximum axle weights and a reasonable starting point, at least until you can get a chance to weigh your unit (packed for travel) for yourself and see what the actual axle weights are. The tire companies have charts of weight vs. pressure to follow once you know the weights. (These are standard for a given tire size and type, so it's not really essential to find the chart from the company that made your tires.)

For the typical Ford chassis class C, the rear tires usually end up needing 80 psi but the fronts are somewhat lower, 60 psi or 70 psi or so. Reducing the pressure in the fronts if excessive would help the ride some. Realistically you are not ever going to get a Cadillac ride out of a class C motorhome, though; it's basically a box truck that happens to have an efficiency apartment in the box.

Tire pressure s/b based on weight of the rig not what's on the side wall. Have the rig weighed and then use one of the charts published by Tire Mfg to set the correct pressure - my Class C rear tires are set closer to 65 than 80 and that's based on the weight on my rig.

And don't assume your tire gauge is accurate. I had a quality tire gauge that read 9 psi too much, meaning I was putting in 9 psi too little. You can read about my tire gauge evaluation HERE.

RonR2440 wrote:
I drive a 32' Itasca Cambria. I keep the tire pressure at 80 psi and the air bladder bags at 35 psi. When we are driving the RV seems to feel every asphalt repair, expansion joints, road damage, etc. Makes for a really rough ride. What do people typically keep their tire pressure at. I realize for the best results you can weigh the vehicle and look at tire charts. I am thinking of reducing tire pressure to 75 psi. I am concerned about tire overheating if I reduce the pressure too much. Thanks ahead of time.

We have a 31' Itasca and it requires 80 lbs. in the rear tires but only 75 on the front axle. I keep the air bags at 60 and it doesn't seem to effect the ride much but helps the sway/lean a little. I replaced the front shocks with Bilstein's which also helped the ride and steering. We've run various tire brands over the years and that also effects the ride and noise level. Now we have a pair of Michelin XPS rib tires that ride smoother and quieter than the others. We use the Escapee's Smart Weigh program and get it the weighed each year before the season starts so we can adjust the load front to back, and left to right as needed. They will also test your pressure gauge for you.

Dave

I own a 09 Cambria and experienced the same thing. I changed my shocks to Koni's and eliminated the rattling and banging.

There is a thread on shock absorber upgrades debating between Bilstein's and Koni's. Stock shock absorbers are worthless. I chased the issue with air pressure changes etc. The difference in ride was remarkable.

I have a 12 aspect by winnebago (28ft). its approx 12700 lightly loaded. We dont carry much for weight less than 1/2 tank water, dump grey and black when they indicate more than 1/3 full. Pull a hyundai elantra. run 75psi in rears, 60-65 in air bags, 65-70 in front tires and the air in the bags makes a big difference imo. too little it will wallow in winds and when being pushed by bow wave on semis and busses. found the sweet spot about 60 in the bags. Just need to play with the settings and TPs remember that is for MAX weight at 80psi

ron.dittmer wrote:
And don't assume your tire gauge is accurate. I had a quality tire gauge that read 9 psi too much, meaning I was putting in 9 psi too little. You can read about my tire gauge evaluation HERE.

Ron,

A note on gauges. Those stick type gauges were not allowed in the VW/Porche/Audi shop I worked in years ago. I guess you now know why.

My 1990 Winnebago Warrior has rims that are clearly marked "65 PSI Max". My door sticker says 65 PSI rear, 58 PSI front. I use Load rated E tires but their loads are de-rated due to the PSI limitations of my rims.

Steve

Dakzuki wrote:

ron.dittmer wrote:
And don't assume your tire gauge is accurate. I had a quality tire gauge that read 9 psi too much, meaning I was putting in 9 psi too little. You can read about my tire gauge evaluation HERE.

Ron,

A note on gauges. Those stick type gauges were not allowed in the VW/Porche/Audi shop I worked in years ago. I guess you now know why.

My tire pressure confidence jumped way up since my evaluation. I have not used any stick gauges since. I do keep the ones that passed, just in case.