Best trailer tires hands down imo is the hercules h-901 . They are a comercial tread. Will last forever. 15in rim is 80 psi and if you upgrade to a 16 in rim and run the compared size you had in a 15 in rim, the tires are 100psi. No more sway , look for a all steel tire. If it has polyester in the tread,belts,or side wall you do not want them. I have alot of trailers small to very large. my large trailer runs the 235 85 16 dually wheels and those are load g 110 psi. I Tow very heavy loads. I have gone round and round over the years with trailer tires. Then i found these. They where founded rite here in the usa in the 50s i believe and they are made in ohio.