I have a 15 jku with 3:21 gears. I tried pulling a trailer not long ago and it struggled. I wna eventually go with 35's but wna pull my little trailer too. I was gonna go to 3:73 but then thought bout 4:10. However I'm on a budget and to my understanding if I go above 3:73 I have to get new carriers too. Any suggestions would be greatly appreciated.