What you are referring to are shackle straps. Yes they are a wear item and generally RV suspensions come from the factory with straps that are 1/2 the thickness than replacement straps available from Mor Ryde. You should also replace the bolts with greasable bolts(refered to as wet bolts) as well as brass bushings. The bushings found on original equipment suspensions are plastic and wear out very quickly which causes the straps to fail. Google MorRyde suspension parts and you'll see what I'm talking about. You can buy everything in a kit.