At some airports, the curbside check-in has monitors outside which the skycaps reference. STL comes to mind as one that has them outside.

When I travel with lots of demo equipment I like dropping it off at curbside check in. Since the extra airport security hit about three/four years ago, now at major airports I am unable to leave the rental car long enough to move the boxes to the curb. What am I supposed to do? Drop it off on the curb to go return the car before I give it to someone?

Since I don't seem to get any cooperation from the security personnel, now I lug it out of the car, onto the rental shuttle, then out again to the skycap. A couple of the boxes are close to 70 lbs (just light enough to meet the airline weight cut-off).