Were your tires 15 years or were they 4 years old. If they are 15, that is the problem. The rubber breaks down over time with exposure to the sun. I have a 95 Triton two place with the same size tires and have never had any problems with them. I replace them at 7 years max or when they are worn down to the wear bars. I am running load range C. Also, what speed are you running at? I use Carlisle Trail USA tires and per the web site, they are rated at 62 mph. I run at 70 mph without any problems but not any faster. I keep them aired up at 50 psi when I have two sleds on or my Gold Wing. I only run Carlisle's on my small trailers. I have not had good luck with all the made in China tires that are out there for trailers like this.
If you do decide to go with a narrow tire, you will have to stay in the 8" range. If you go taller, you loose the clearance between the tire and the trailer deck. You would have to put a spacer between the axle and the trailer frame.
2018 Skidoo Summit Sport 600
1996 VMax 600 Mountain Max
1994 Indy Lite GT
Last edited by snowmoer; 05-07-2019 at 11:03 AM.