you cant test the suspension unless its flat on the floor, no dollies. as for the fra, in the middle of the skid you will see a long goldish bar, actually 2, one on each side of the shock. at the front of this bar its attached to the "full rate adjuster"(fra). the fra has an a,b,and c slot. c is the hardest, a being the softest setting. loosen the bolt or nuts and move to the desired setting. the shock next to the fra will either have a threaded aluminum body or a black steel body with a cam adjustment. figure out which shock you have. the cam adjust will have seven indentations. the indentation closest to the spring is softest, the one furthest from the spring is hardest for the shock preload. obviously you can stop anywhere inbetween to find a setting you like. if the shocks are aluminum threaded, there are to locknuts on the shock and by tightening these, the preload is increased(stiffer). shock adjuster tools are handy for this but you can animal it with a screwdriver and a hammer. if you have the cam adjust, you can animal that with some channelocks. make a note of your starting point and make one adjustment at a time until you get it where you want it. the shock at the front of the skid is adjustable as well. all the parts work together, including the front ski shocks. problem i see is that if you have springs for a single rider and add a passenger, the springs wont suffice. stiffer springs are available but may create a harsh ride when solo. cant have the best of both worlds without getting into multi-rate springs and shocks with adjustable dampening. hope this helps. let me know if you have more questions.