i have come across this issue at work manytimes on vehicles at work,you may not have a problem at all. too many times customers that are heavier ,while getting out of there car and in so doing will without knowing it end up putting full body weight on the drivers or passangers floor which in turn drops the suspension on that side.everone does it regardless of their weight . but, the amount of suspension compression will very. some people load and unload out of cars differant. so the best way too check your real level is to open the drivers window and roll the car back and fourth a few feet, this will settle the suspension and then you can take some measurments side to side.switching shocks left to right will have no effect .