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Old 01-12-2011, 06:51 PM   #51
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Me want to camp. Me needs to drink beer after reading this thread. Me no want flat tire!!!
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Old 01-12-2011, 07:01 PM   #52
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Ditto
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Old 01-12-2011, 08:57 PM   #53
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I think another factor (to make it even more complicated) is that you're not working with hard attached axles, but spring hung axles. The flat tire will not only cause one side to sag, but cause the axle springs to react allaround redistributing the weights.

In addition to this, the trailer, weither a 5'r or pull behind, is not supported at four points but five points, the fifth point being the hitch. So, more complexity. Your force drawing needs to be redrawn to show this.

All of this really gets much too complicated to think about (I'm getting a headache just writting about it).

While I too am an engineer (Pulp and Paper Engineering - weired eh), I am also the son of an old time, self taught engineer and farmer. My dad's solution to this problem (if he was still with us) would be to find a DoT or statey officer with four wheel scales, pull the tires on each scale, weigh each point, then flatten one tire and see what happens (also, knowing dad, he would repeat this test at each wheel point).

Maybe not as elegant solution as a mathamatical solution, but sure is a lot easier to do!

Rick
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Old 01-12-2011, 10:24 PM   #54
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It is even worse with our Al-Ko Rubber torsion axles. My son Lou also made the point about the 5th wheel support. I am with you. I think this summer I will make a trip to the scales and pop a wheel if the scale operator is not busy.
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Old 04-25-2017, 01:56 PM   #55
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Did anyone ever actually measure the weight on each tire when an tandem axle trailer has a flat?
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Old 04-25-2017, 04:18 PM   #56
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No, sorry.

Maybe if there are wheel scales at the Goshen rally, we could nail this down.
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Old 04-26-2017, 07:44 AM   #57
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Quote:
Originally Posted by wboudx View Post
I just picked up a new Flagstaff 831FKBSS and I did bring a PDI, but I still missed the part about "jacking point". How do I jack up my Flagstaff to replace a wheel?

Walter and Cathy
I was told to create a ramp with two short boards and drive one wheel up on the created ramp. Then service the other wheel. One board creates the ramp the second board goes under the end of the first board to create the rising angle in the first board. I have used this method several times.
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Old 04-29-2017, 10:08 AM   #58
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Trailer Aid

You might want to check into the "Trailer-Aid Plus", we have a Jayco 264 and we had a flat and put the trailer on the TA and when the service guy tried to put the spare on it was too low. He had to drag his jack out and raise the trailer about an inch. Better to get the PLUS right off the bat as it's about 2" taller.

BTW looking at trading the Jayco264BHW for a Flagstaff 27RLS. Wish us luck!!
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Old 04-29-2017, 10:29 AM   #59
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Good Luck! Youroo!!
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Old 04-29-2017, 11:21 AM   #60
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Okay, I've been looking through this thread a bit more and EVERYONE is overthinking this WAY too much.
I drove 18-wheelers for 25 years and had many flat tires on truck and trailer. Limped into nearest safe place or tire shop and had them worked on. As long as your jack is rated to the GVW of the trailer, you'll be fine. All this talk about tire loading is irrelevant as you're talking static loading versus dynamic loading. When you have the trailer on the jack you have basically 50% of the trailer weight on it and the rest on the other pair of tires. Even using the Trailer-Aid you're not going to hurt the tire. Engineering safety factors are usually 50%, and if you upgrade tires all the better.
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