Hi, I am building a cart for my dog to pull around. Im going to put my child in it once they are about 1. Something like this. The paths we plan to go on though are not very smooth so I want to fit some suspension to the cart to make a smoother journey. Now the weight of the cart will be relatively little so I cant use trailer or automotive suspension, so Im wondering how do I calculate what suspension is required? I've google but not found a simple "input weight and find what suspension required" type formula. I want it for "comfort". This isn't a race cart and wont be cornering fast. I'm sure I could make some sort of leaf spring / silvercross pram type suspension. but no idea to what forces it should be set to? twice the weight of the cart? 3x? 4x? not a clue.