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Old 06-21-2014, 03:46 PM   #1
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Got the Coach Weighed

This was a first for us and couldn't believe how easy it was. Pulled into a Flying J and drove up to the CAT scale. Lady ask a couple of questions and that was it. Went inside and paid 10 bucks and received the report.

Steer Axle: 6820

Drive Axle: 11980

This was pretty much with everything we usually travel with and 1/3 tank of water. It looks like we are way below our max for our 2013 F53 205k chassis.
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Old 06-21-2014, 03:57 PM   #2
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Tire Inflation Gurus

I know that I didn't have each corner individually weighed, but I figure front and back will give me a ball park PSI for my tires.

I have Good Years 245/70R19.5 tires and according to their chart (see attachment) I'm at the low end of the recommended pressures.

The chart is telling me that I should se the pressure ~80 PSI. Problem is that when I had the pressure set at 82 (from the dealer), I noticed more sway in the front. When I increased the pressure to 92 PSI, I noticed less sway.

Any thoughts?
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Old 06-21-2014, 03:59 PM   #3
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It feels good to know actual weights.....no assumptions!
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Old 06-22-2014, 06:33 AM   #4
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well more inflation = stiffer sidewalls = less movement. also the tires should run cooler and you should get the best fuel mileage. when towing trailers, i have always run the truck and the trailer at maximum cold inflation for all these reasons. a downside is that more center wear is certainly possible, and i always rotated my tires every 3K on the tow vehicle to get maximum life (i can rotate my tires in my driveway, so it's easy on a pickup; not so much on the coach now, of course). i plan on asking the shop that will be doing my servicing what they recommend for tire rotation intervals; i have heard that 10K is a good number from other sources for my 22.5" tires.

we have not finished loading our coach yet, but when we do i plan to weight it also and adjust my tires. i don't think i will do the 4 corner weights, unless i am very close or over my max. axle weights should be enough as long as handling is reasonable, i should think.
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Old 06-22-2014, 06:42 AM   #5
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I have found that the 90-95 psi range gives the best feel driving down the road. This is on the 18,000 lb chassis. Ford called for a min of 82 psi in all the tires. Dealer had the tires at 62-68 psi when we picked the unit up new.
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Old 06-22-2014, 08:20 AM   #6
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Quote:
Originally Posted by rgmiller32 View Post
I have found that the 90-95 psi range gives the best feel driving down the road. This is on the 18,000 lb chassis. Ford called for a min of 82 psi in all the tires. Dealer had the tires at 62-68 psi when we picked the unit up new.
When we picked up our new coach the drive home was a real event. The thing just wandered all over the place. And I thought...what have I got myself into! Parked it at the house and dug out the handy 10-150psi tire gage. Front left-66psi, front right-94psi, all the rears-90psi. So much for the dealer doing his job in getting the rig ready for the customer. Now all tires are at 90psi and, along with the CHF, nothing else is needed for our coach. Check those tire pressures. I believe that having them all equal is more important than, say, one tire at 86psi and another at 90psi. Just an opinion, folks.
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Old 06-22-2014, 08:53 AM   #7
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Had my coach four corner weighed at freightliner in Gaffney,SC. I always thought that all tires needed to be equal, but they put 100 psi in fronts and 90 psi in the four rears, adjusted to my axle weights. The coach handled better than before.


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Old 06-22-2014, 09:12 AM   #8
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Well, it looks like a lot of folk that use drive/steer axle weight divide it by two and add 10 PSI. It would appear that the pressure I have then at is pretty close to were they should be.

Taking it a little bit further, and knowing that there would be a difference in weights from the driver and passenger side, I could take a wild guess and say 45% on one side and 55% on the other. Using the higher load on my front axle would mean that 3751 is more realistic than dividing the entire load in half. According to the chart the recommended pressure is 85 + 10 = 95. The rear would be 3294 which is below the lowest pressure. Being that the minimum pressure is 80 + 10 = 90. So technically, I should be good with 95 front and 90 rear.

I've also heard of a lot of folk using the maximum allowed cold pressure. In my case it would be 110. In my case I think it would be overkill since I'm way under max loads. Using this theory, it would make sense to do the front at 100 and rear at 95.

Sorry, strong cup of coffee this AM. I think I'm going to try the 100/95 on the way back from FL to OH to see how it handles.
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Old 06-22-2014, 09:50 AM   #9
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Let us know how that 100/95 works for you. Been considering increasing mine a little.
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Old 06-22-2014, 03:08 PM   #10
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Quote:
Originally Posted by gasman94 View Post
Had my coach four corner weighed at freightliner in Gaffney,SC. I always thought that all tires needed to be equal, but they put 100 psi in fronts and 90 psi in the four rears, adjusted to my axle weights. The coach handled better than before.


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This, by the way, was on a trip by myself. With the family and extras, I have boosted to 100 in rears and 110 in front. Seems to work well. TPI shows that the tires aren't getting too hot.
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