The Equa-Flex Cushioned Equalizers # LC145546 that you referenced is a kit of two equalizers. These are rated for use on axles with capacities between 5,000 lbs and 8,000 lbs. So since your 15k trailer would most likely have a pair of 8k axles this kit would work great at smoothing out your ride quality as well as being properly weight rated. view full answer...