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Originally Posted by KOWBOY
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Originally Posted by NTSQD
I think that the whole trail spares thing is over-rated.
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... unless you travel alone and do more than drive on dirt roads. 
A few trail spares could save a long walk. I hate walkin'. 
In addition to lookin' bad-ass ... the object here is to avoid havin' to carry two different spare tires. 1 spare for both the trailer and tow rig and also a high-quality plug kit should get you off the trail.
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I mostly do travel alone. I don't like walking either. I'm working towards the tire sizes being close enough that the spare for either will work on the other. Perhaps not ideal, but will work.
Currently the trailer tires are 33-12.50's, that is absurd and obscene for a 650-850 lbs trailer. The trailer can run with 5 psi or 35 psi in the tires and it has little effect on the semi-bouncy ride. I've yet to mess with the RS9k knobs. Given the large rising rate of the rubber torsions it seems inadvisable to back off from full stiff. It will be getting 31's before the next trip out. My 60 is rolling on 33-10.50's and I see no reason for me to go larger.
Using a spare rear axle under a trailer means that the R&P will be turning and for that to live you'll need to keep the diff full of lube even though there is no load on them. That is an awful lot of added weight & complexity to offset the potential of needing a rear axle shaft or drop-out in the field.
One of those things that sounds good sitting at home, but really isn't all that practical.