I hear ya...I'd tell them no too.
Just like the time I got pulled over in this little bohunk town
for my license plate light not working...and I got out to look
for myself and it was working just fine, and the guy wrote
me a warning.
Then, asked me if he could look through my truck and
I told him no, "not without probable cause" (exact quote)
and he said "I know, but would it be OK if I looked anyway?"
And, again, I told him "No, not without probable cause"
and I calmly put it in drive and slowly began to drive off.
Both him and his buddy just stood there and didn't
chase me or anything so I guess they figured that
they did have anything on me.
Course, I do have long hair (about half way down
my back) so they probably thought I was either
on dope or peddlin it...but they're about 20 years
too late to catch me on that rap...
So, I guess I can see why those coppers were
wanting to look through my truck. I didn't
hold it against them, I just politely said NO