Thoughts in what way?
I think most of us make the change simply in order to put an adequate capacity LT tire on the trailer in lieu of the ST tire. That was my reason.
My only slight concern was whether there might be some clearance issues but since others had made the change on the same model trailer as mine I assumed all would be well - and it has been.
I've been very happy with the Michelin LT tires so far.
The only reason Iswitched was due to the seemingly increasing evidence that major tire problems leading to trailer damage would be less likely than with the original Marathon ST tires I had. (I did experience delamination and trailer damage with Marathons on a previous trailer, so I was happy to make the switch after monitoring the forum on this subject for quite a while.
Apart from having no problems with the LT tires after four major trips (over 4000 miles each) and a few shorter ones, there have also been a couple of other smaller side benefits.
I never seem to need to add air, whereas I was forever topping up the Marathons - no idea if others have found this.
My impression is that the new LT tires are wearing much more slowly than my previous ST tires. They still look brand new, whereas the last set of ST tires I had (Towmax) seemed to wear very quickly and in a manner that made me suspect I might have an alignment problem. Now that wear pattern is no longer there. Seems strange.
Not sure what else you were interested in with respect to 16" vs 15"?
Brian & Connie Mitchell
2005 Classic 30'
Hensley Arrow / Centramatics
2008 GMC Sierra SLT 2500HD,4x4,Crew Cab, Diesel, Leer cap.