Load rating 113 vs 115

I looking to get new tires for my truck. I'm pretty much set on the michelin defender ltx ms. Deciding between 275/55/20 which is the stock size and is 32" and 275/60/20 which is 33".
The website has load ratings of 113 for the 32s and 115 for the 33s. I realize that these aren't E rated, which is good for me. I'd prefer the ride of a P or LT tire. I just don't completely understand how much, if any stiffer the 115 sidewalls will be. And I'm sure someone here will know.
Thanks everyone.

 

You won't notice the difference. Since the tire is physically bigger the load rating is a little higher.

 

I've had the Defenders on my truck with the stock 275/65R18 size for around 10k miles and the ride is very nice and a little quieter over the OEM LTX AT2s so if I can get around 60k out of them I'll be a happy camper.

 

Thanks