ok Overall product is good - good idea but I would prefer air adjustable ones - travel is not adjustable - they don't have air adjustable pads for RV Sprinters - they were easy to install although I have haven't figured it out yet, they made me swear once! After installation I tested it on a 3 mile ride - I also fitted sumo front springs - and went for the black 1000# version - I don't recommend them for sprinters, not even my class A - build blue ones front one - now for REVIEW - although wind sway and halfway sway there was almost none, it wasn't without price - price - rougher handling - slightly more potholes and bumps in the road - much better after putting the fronts on the 500# blue version had changed - anything and everything - was it worth it? - I say yes as a rougher ride is better than white knuckles anytime - I'm keeping them until they come out with airbags at least!