I did the full kit to my 8000lb dry weight Holiday rambler , the kit is well built and does exactly what they claim. From the seat of my pants before and after is noticeable smoother in the truck . Becarefull they sell two differnt kits one with just the center ezualzer and one with all the greaseable shackles and brass bushings , you want the full kit and as stated its about $230~250 .If you do the work make sure you have a torque wrench so you dont over tighten the shackles. The dexter web page is hard to figure out , there are only two common sizes one for 3500lb axels and one for up to 6000lb axels.
2001 Holiday Rambler 31' cks 10000 lbs loaded
2006 2500hd duramax/allison crew cab