Of course, the ratings do not change when I modify the suspension*. The truck doesn't know anything has changed.
But depending on the engineering solution to determine the weight, the values registered by the truck may now be grossly inaccurate. Thats why I am curious to know how they do it. For example, if pressure readings from TPMS sensors is used, it is difficult to calculate the load when the vehicle is not on a flat surface. At least that is what the control circuit of my truck's airbags has me believe...
*) At the risk of derailing the thread: Here in Germany, the registration document lists the axle weight ratings and GVWR, among many other things. Invariably, it has the values from the door sticker. Changes can be made, but are very difficult to obtain, with all the required documentation being in a foreign language, if it exists at all. The values in the registration document are binding; if you exceed the numbers when you are weighed (which can and does happen), you are in trouble and may have to unload your camper to continue. Exact regulations vary from country to country, Germany usually accepts 5% over, other countries are more strict.
It is always fun to read how relaxed this is seen in the US. Be glad for what you have, believe me.