Probably a dumb question but is the lug pattern on a 5 lug 13" rim the same as for a 12" rim. I'd like to change my 12" to 13" if it will clear my fenders. My boat is probably under 1000# but I tow it to south Florida each year and after 2 trips the thread is worn down a good bit. Even wear on them so I don't think it is alignment or balance issues. Seems just towing over 1000 miles at interstate speeds takes a lot out of them. Mu local trips throughout the year are more frequent but less that 50-80 miles round trip.
This current pair are Kendra load range C and have 2 trips on them and I'm not sure they are good for a 3rd one.