Gross Vehicle Weight? are you sure? 4000lbs sounds almost low. GVWR (which is whats stamped inside the doorjam) is NOT your vehicle weight, but rather than how much your vehicle can weight at maximum capacity.

What I think you're referring to, and what this thread is about, is curb weight, or how much your vehicle weighs just sitting there. Not to be confused with GVWR.

-Rob

EDIT: Smiley, on a side note, you may have that weight rating on your registration due to titling issues. For instance, if your Rodeo is classified as a "car" rather than "truck", you probably can't be much more over 4000lbs. For instance, in NC, my F250 has to be registered with commericial/weighted plates since its GVWR is over 7000lbs... I pay almost $200 to tag it each year in order to cover it and a 10k lbs trailer.

-Rob