[Johnsonw]

Help! I'm in the middle of a month long trip with my son, currently in New Orleans, eventually heading home to NJ. I was just inspecting my trailer tires (G614 RST 235/85/16), and one of them was severely worn on one side, just down to the steel belt on part of the tire.
I have the Moryde IS Suspension, installed 10,000 miles ago. I'm assuming I have an alignment issue (camber wear).
Questions:
-The thread depth on the remaining 3 good tires is between 7-8/32", with new being 12/32". I heard below 6/32" should be replaced?? The tires have 20,000 miles and are 4 years old. I think I am answering my own question and I really should replace all four?? WHAT DO YOU THINK?
-If I replace all four tires, I was thinking on going with Sailun 235/85 or 80/16. ANY SUGGESTION ON WHICH SIZE AND WHERE I SHOULD BUY THEM AS I NEED THEM QUICKLY?
-More importantly, I need to get the IS suspension aligned. ANY SUGGESTIONS AS TO HOW TO FIND A LOCAL DEALER THAT CAN HANDLE THIS JOB?
Thanks
Walt
(908) 240-9947