I need to replace my stock Duro's "E" rated next year. Tread & sidewalls are still very good but they're hitting close to 6 yrs old and I almost always have to add 10-15lbs of air everytime we want to go camping. I have a big trip planned next year and I want tires to be the least of my worries. I did some research months ago and concluded on going with G614 but dreading the cost. That is until I hit this thread. Wow, lots of great info in here! I have 7000lb axles but I also don't load up to capacity or even near my weight capacity limit. I'm not a full-timer or anything remotely close; long time before I can retire. So, I was debating if "G" rated were more about handling max capacity, peace of mind, combination of both or something else I'm missing? I also want (like to have) tires that are rated above 65mph just for that extra margin of safety. I hope the positive Sailun reviews continue.