I have an 11 puma, it came with Cooper Cobras. Have had 2 blow outs and 1 got a big blister and had to be replaced. I live in Texarkana, less than a mile from Cooper service store, so I take my boat to let them look at the tires. The first thing the man said was ” I cant believe anybody would put a cheap— tire like that on a boat trailer “. The man said the Cobras are 4 ply tires. He said he had a 10 ply trailer tire that was cheaper than the Cobras and would last five times as long. He said to run 50 psi in the tires. My trailer pulls and handles so much better ith hard to believe. He said you need at least a 6 ply tire on any trailer.