The first couple of posts mentioned 15". I thought you were "debating between 15 and the Ford 16" you bought. I think the Ford wheels are a good choice. However, I'm not sure you would be pleased with LT tires. Here are the specs.
LT245/75R16 30.5" 9.8" 17/32" 7.5" 6.5-8" E 3042 lbs 80 psi 44 lbs 683

I run LT Michelins on my 3500HD. But this is the kind of things that I do with my GMC.

https://plus.google.com/11263693037...5156051106&oid=112636930370126476644

The old cabover weighs 16,000. The trailer has 17.5 tires.
235/75/17.5 6005 lbs (single)18 ply Load Range J 10k super single

I wasn't near the rating of my tires anywhere, but it rides rough. I don't think that is what you are looking for. The pickup tires are recommended at 80psi and the trailer 120 psi.

I still think you should talk to someone at Michelin. They have an 800 number. I think a SUV tire is what you should be looking at instead of light truck tires. I have SUV tires on my Town and Country, run them at 32 psi and it rides good.