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Old 10-22-2019, 08:46 AM   #15
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Our 32SA also had the blue Saf-T-Plus installed
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Old 10-22-2019, 10:31 AM   #16
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I need help interpreting this Michelin guide for my 255/80R22.5 XVR.

This summer I was going to a dry camping location (Music Fest) and I filled my 80 gallon fresh water tank and topped off the gas tank. After gassing up, weighed in a Cat Scale on Rt 80 in PA..... Steering axle came in at 8900 lbs and Drive Axle at 15900 lbs. Tiffin Allegro Open Road 36la is rated at 9000 steering and 15500 drive axle on a 24,000 lb chassis.

I was 300 lbs over!!!. Clearly, I am new at this....SLC (STEEP learning Curve).

First question: All these numbers are cold-measured, yes?

2nd: in the chart, "Dual" reads, at max air pressure 110lbs, 9610 lbs. Does that mean, if the drive axle is RATED 9610 X 2 =19,220 at least then, if the scale weight of the loaded RV is 19,000 lbs, then the XVZ tires s/b inflated to 110 lbs.

Then, if my drive axle weighs 15900 lbs (that day), then 15,900/2= 7950 lbs, I should have my tires inflate to cold pressure readings of between 80 and 85 pounds?
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2016 2-Door Wrangler JK, Blue Ox Alpha & Patriot 2
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Old 10-23-2019, 05:24 AM   #17
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Quote:
Originally Posted by Reyfeo View Post
I need help interpreting this Michelin guide for my 255/80R22.5 XVR.

This summer I was going to a dry camping location (Music Fest) and I filled my 80 gallon fresh water tank and topped off the gas tank. After gassing up, weighed in a Cat Scale on Rt 80 in PA..... Steering axle came in at 8900 lbs and Drive Axle at 15900 lbs. Tiffin Allegro Open Road 36la is rated at 9000 steering and 15500 drive axle on a 24,000 lb chassis.

I was 300 lbs over!!!. Clearly, I am new at this....SLC (STEEP learning Curve).

First question: All these numbers are cold-measured, yes?

2nd: in the chart, "Dual" reads, at max air pressure 110lbs, 9610 lbs. Does that mean, if the drive axle is RATED 9610 X 2 =19,220 at least then, if the scale weight of the loaded RV is 19,000 lbs, then the XVZ tires s/b inflated to 110 lbs.

Then, if my drive axle weighs 15900 lbs (that day), then 15,900/2= 7950 lbs, I should have my tires inflate to cold pressure readings of between 80 and 85 pounds?
Joel as you stated this is a 24K chassis not the 26K. One option, go to a spring shop to update the rear spring pack to the 26K standard.
You are overweight by 400 lbs rear axle.
Tire Pressure Front 90 psi good for 4620 /axel, Rear Duals 85 psi good for 8080/axel.
As loaded you could be exceeding the limits with your toe vehicle. Also toad tongue weight adds to axel load.
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