there's a discussion on this at forAbodies only too...
I buy trailer tires every two years. I live in he77... it's hot, dry, trailer sits outside with tires always covered, road temps can reach 140. Often I stop for fuel, rest, beer... and check the tire temps. They all run around 130 degrees. I run them at the max sidewall rating (these were E rated 95psi). Not sure I subsribe to that theory... as the heat will drive this psi up quite a bit.
We just got back on a round trip from west AZ to SoDak and back. The tires were on the trailer my dad had. The tires were 4 years old (spent all those years in SoDak), and surprisingly the tread was nearing the wear bar which is an experience that i've never had before. I was thinking they were "due"...but we made the trip without a hitch until 200 miles from my house when one let go..... third one I've blown out on various trailers and have yet to lose a fender.... lucky!! We ordered this trailer with 16" tires as I'd been lured into the trick of the day that 16's were the way to go. Jury still out on that one, but I do agree that there are a lot more choices.... including LT tires. I bought a set of "Hi-Run" ST tires. They are chinese (as were the OE set), but only have a max cold air rating of 80. Same load rating and ply that I can see, but the OE tires were rated 95psi on the sidewall.
I have a hard time buying an expensive tire here.... on my Haulmark trailer, which had 15" tires I did two sets of the OE Goodyear D Marathons (first set was recalled), Carlisle D rated, some no name D rated, Maxxis E rated, and then some no name cheapo E rated that were on it when I sold it.
The only other 16" option I've read up on is the 14 ply G rated tire. These have a cold psi rating of 110 and you have to have the wheels that will support this which my steel wheels are not. Not sure if there is a wheel in my 6 lug set up either... Most I found were 8 lug. Here's an example...
http://www.ebay.com/itm/LT235-85R16-LRG-...4e1&vxp=mtrPersonally my next set of 16's are going to be LT truck tires.... keep hearing more and more people perfering this route.