My owners manual states that you may use ST or LT tires as long as they are rated for the weight. now my sunset creek has a Lippert frame and axels . Now my owners manual , DOES NOT state a specific brand . it doesnt say if you should buy cheap tires , or expensive tires and it did not say to email the tire manufacturer for permission to use their tire on my TT . Since my owners manual says either type of tire is acceptable , I chose the LT tires for the added weight capacity , the higher speed rating , and the ease of locating a replacement if necessary .