Regarding Michelin Tires :
I just bought a new set of Michelin LT2 highway tires from Costco on the rebate / exec member promotion offering a $ 60 rebate plus $ 70 rebate .
I paid net $ 729 installed for size LT 265 /75 R16 Load range E after rebates .
They replaced a similar size LT 265/75R16 LRE Michelin that I had run for 60,000 miles on my duramax pickup .
The previous tires were not to the wear bars but I could not pass up the super-dooper sale price of $ 729 after rebates in early Sept 2014 ..
My original factory tires were the LT 245 /75R16 LRE .
The diameter of these LT 265 /75r16 LRE is 31.7 " .
They may have fit where the ST 235 /80 r16 trailer tires go because the diameters are the same at 31.7 " .
The LT 265 /75r16 LRE is placarded at 3415 # on the LT scale .
A logical upgrade for replacement of the ST 235/80 would be to measure to see if an LT 265 /75r16 LRE will fit , especially for the heavy toy haulers and 5th wheels .