Drive the pickup to a scrapyard where you drive onto a scale. Get the weight of you and your truck, then repeat the process with her in the vehicle and do the math. You'll have to scrap something both times, but if you really want to know without her knowledge...
Seems like a lot of work anyway. I agree with all the above who advocate the boner test over raw numbers.
Seems like a lot of work anyway. I agree with all the above who advocate the boner test over raw numbers.