18 wheels, a dozen roses & a box of tampons

We are freaking out the world in the truck. Nearly every time we swing down out of the cab, a (male) passerby will cat call something along the lines of "you little ladies are driving that big thing?"
When only one of us gets out of the truck, gas station attendants and hotel clerks assume the one still in the truck is male."There is no man in that truck," we correct them.
This is a pattern that is repeating itself with no-longer-alarming predictability. Like, daily. Like, several times a day. Even though we've come to expect it, it's still a strange feeling to have the world react with surprise to something that is not really a big deal. It is not challenging to drive our truck. Sure it is designed to fit a man's proportions, but so much of our world is that I can easily adapt. My feet reach the pedals and my hands reach the steering wheel. The truck has power steering and cruise control. No big deal.
The big deal, we've decided, is that women aren't supposed to take up so much space. Racing down the highway in a big fat truck is not so ladylike. And when we pop out of the cab wearing dresses and looking so feminine it freaks people out. It's a novelty. Culture (women shouldn't take up so much space) is misinterpreted as nature (women can't physically do things that take up a lot of space like drive trucks) and confusion results.
I'm used to causing this kind of confusion. I've driven tractors, played guitar in punk rock bands, and basically bucked gender expectations ever since I hit puberty. I know it draws attention and comment. I guess I'm still, after all this time, still surprised that it's 2009 and I'm a woman doing something that men do.
I can't just be a person doing a thing that people do?