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Old 02-29-2016, 05:23 PM   #15
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Originally Posted by Boxster1971 View Post
Those rubber valve stems on the inner dual wheels are a real problem if you attach anything besides the lightweight plastic extensions installed by Mercedes. I attached a set of flow thru caps on mine and I'm sure they caused the flat I had.


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2013 Interstate Lounge EXT on 2012 Sprinter
It's pretty odd they economized on the rear wheels when the front set have solid metal valves and stems.
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Old 02-29-2016, 07:30 PM   #16
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The best extension for the 3500 Sprinter is made by the Tireman up on the grapevine. They run about $150 and another $100 to get them installed. The ones on Amazon don't leak quite as fast as the rubber extensions at Camping World.
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Old 02-29-2016, 07:54 PM   #17
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I have the rear duallyvalves and the TST TPMS on all six tires (I forgot to take Protag's advice and put one on the spare.) It is an expensive combination but gives me some confidence that the inner duals are fully intact and properly inflated when driving down the interstate at 70 mph. I'm also too lazy to check tire air pressure at every gas station stop like all good RVer's are supposed to do. Installation requires some babysitting of the tire technician. It is not an intuitive process and took two attempts to get it right. I had to call the duallyvalve folks to ask them for installation tips on the second time around. I am very happy with the set up now.
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Old 02-29-2016, 09:04 PM   #18
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It's pretty odd they economized on the rear wheels when the front set have solid metal valves and stems.

Those front metal valve stems come with the Alcoa wheels. Only the rear inner duals are stock Sprinter steel wheels with rubber valve stems.


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Old 03-05-2016, 09:41 AM   #19
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I just ordered a new trailer to haul my motorcyle. My old trailer was a single axle, the new one is tandem so I needed two additional sensors for my TST Tire Monitor system. In searching I found prices all over the map but the best I found was Roadtrucker.com which had the non-flow through RV507 sensors in a 2 pack for $89 shipped. Their complete systems also seemed very competitively priced.
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Old 03-05-2016, 05:14 PM   #20
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+1 on the dually valve extensions. It was my first modification and on a recent first 6 week trip I had zero problems and no air loss
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Old 08-20-2016, 01:01 PM   #21
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Ditto on the TST TPMS. Very easy system to install and use. User replaceable batteries are a big plus with this system.
Any reason you chose TST vs. TireMinder? Both get positive reviews online and here in the forums
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Old 08-21-2016, 07:50 AM   #22
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I chose based on the recommendations of members on this board and one of the TST reps was a member of these boards and participated in many of the discussions.
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