GREAT QUESTION Ive owned RV;s for fifty years,,,,,,,,,A ton of Class C's (I'm a user plus a past used dealer) ,,,,,,,,,,,Experienced blowouts OFTEN THE PASSENGER SIDE INSIDE DUAL
Its MY OPINION so often a blow out is due to under inflation which increases heat due to friction so KEEP TIRES AIRED UP and at each gas stop use a temp gun to find over hot tires and/or perhaps a hot wheel due to a dragging hanging caliper..
Here's MY OPINION of why the passenger side inside dual is often the one that blows out
1) Due to the ever slight crown on the road its THE INSIDE rear dual that carries more weight (causing more heat and more PSI) versus the outer........
2) Often the inner dual is closer to the heat of an exhaust pipe
3) The inner dual runs hotter then the outer due to less cooling air flow past it
4) If the inner dual runs hotter it increases air pressure more then the outer thereby a tad bigger diameter thereby carrying more weight then the cooler outer dual
Heres what I do that may help
1) I run about 4/5 more PSI in the outer then the inner dual
2) I believe theres a chance that will even out the load each carries for the reasons above
3) I when cool air my tires to the MAX LOAD AT X PSI on the tires sidewall (but outer left dual 4/5 more) and NOT less to give me a softer ride. My Load Range E 10 Ply rated LT 225 75 x R16 on my Class C call for Max Load at 83 PSI
NOTE when shopping for tires in my size I found Michelin and Firestone had a max load rating around 2500 Lbs but Continental Vanco Four Season were 3195 SO THATS WHAT I BOUGHT and even if tread is fine I change out at five to no more then seven years
NOTE Im NOT a tire expert or a mechanical engineer but a Lay Person (owned RV and trucks of all kinds over fifty years) and this IS ONLY MY OPINION which others may disagree with and/or have other theories which is fine and welcome TO EACH THEIR OWN OPINIONS Lets get along and help each other, NOT fight, best we can and figure out why its often the passenger inner dual that blows ?????????? Love to hear other reasons and love to hear from professional experienced tire experts and other lay gents like myself
Best wishes everyone, be safe and God Bless yall and God Bless America
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