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Old 03-26-2016, 07:26 PM   #29
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By far the smartest and best solution on a DP is to use the Cats Eye system or a like system - Crossfires Dual Tire Pressure Equalization System. Both connect the valves of both tires to a hub that equalizes pressure between the two tires and provides a single valve for filling both tires. They are widely used in the trucking industry and provide a visual indication of tire pressure. You need to purchase a one for each side for the pressure you require (based on your loaded weight and tire capacity). If there is a failure on one of the tires, the system isolates the defective tire and the good tire remains pressurized. They are about $120 for a pair (both sets of duallies) but well worth it and an excellent addition to a coach's safety. They much more reliable than RV valve extensions in my opinion. You will find that topping up the tires is simpler and dramatically faster with a single valve than trying to get both tires at the same pressure manually. Equalized tire pressures will theoretically also reduce the wear and extend the life of the duallies. Good luck,
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Old 03-27-2016, 10:31 AM   #30
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With extenders I only top off my tires 2x per year due to relative temperature. I have the extra 5 minutes to make the duallies match.
My TPMS warns me of any temp/pressure issue.


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Old 03-31-2016, 07:31 PM   #31
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Quote:
Originally Posted by bobmac View Post
By far the smartest and best solution on a DP is to use the Cats Eye system or a like system - Crossfires Dual Tire Pressure Equalization System. Both connect the valves of both tires to a hub that equalizes pressure between the two tires and provides a single valve for filling both tires. They are widely used in the trucking industry and provide a visual indication of tire pressure. You need to purchase a one for each side for the pressure you require (based on your loaded weight and tire capacity). If there is a failure on one of the tires, the system isolates the defective tire and the good tire remains pressurized. They are about $120 for a pair (both sets of duallies) but well worth it and an excellent addition to a coach's safety. They much more reliable than RV valve extensions in my opinion. You will find that topping up the tires is simpler and dramatically faster with a single valve than trying to get both tires at the same pressure manually. Equalized tire pressures will theoretically also reduce the wear and extend the life of the duallies. Good luck,
I have a post on my blog specifically on dual tire extender hoses.

I also do not see any meaningful benefit from pressure balancing systems as:

- They provide no immediate driver warning that a tire is loosing air.

- The only way they might be more reliable than simple hose extenders if they are properly installed and the hoses are not properly installed.

-Isolating the leaking tire will still result in the leaking tire shredding and the other tire being overloaded 100% and being damaged due to the overload.

- RV tires age out not wear out so a theoretical improvement in wear is of little or no value.

- If there is a durability improvement due to constant inflation balance, which I doubt, I would really like to see the test data on multiple sets of tires where the pressure is set the same and tires are not connected together vs multiple sets of tires running the suggested system.
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