Chadsalt ... By your last post, I surmise, you think good logical advice is tainted by its source.  You can choose your opinion based on your belief.  But unless you're fooling yourself, facts are not to be selected.

Anyway ... I hope you trust this source better.

http://www.goodyear.com/rv/weighing/weigh_trailer.html

Thank you for the link, but my tire knowledge wasnt in question (nor was I questioning yours).  I tend to take the whole picture into account. Personally I wouldnt quote Carlisle for ANY type of tire related info. The link for Goodyear (a much better choice IMO) displays exactly what Im talking about. People typically assume max psi is the only answer...hard to go wrong with max psi, but it is not the only answer.

Case in point, a lady I know purchased a Calico 2H BP, 12' x 6' on the floor, GVWR 7000#. That trailer came with ST235/80/16 tires, 80psi. Loaded with horses I doubt that trailer weights 5000#. At 80 psi that trailer is one SOB (and probably dangerous as I doubt it ever has more than one tire on the ground) to pull down a bumpy road, loaded isnt much better. I dont know what psi she ended up at, but 80 psi certainly wasnt right. Saleman told her a 16" tire would be "better".  That size tire was a horrible mismatch for that trailer, bigger/max is not always better.