My two cents:
Unfortunately, you've got too many fast food places in and around the area - to include Wal-Mart with its Mickey D's and deli. As always, stupid is as stupid does. I'm not sure what HPD would do with a cell phone call via 911 to report the license plate number of a litterbug. They might or might not follow up.
Plus there is Sonic nearby. I think a well concealed and safe motion camera might do some good. Better maybe a highly visible sign saying LITERERS WILL BE PROSECUTED. $1OO FINE.
We need to help this man find a solution.
Personally, I hide in the bushes and shoot people in their arses with my Red Rider BB gun when they litter near my house. Sometimes I shoot the trunk of their car in an effort to chip their paint job. Haven't got caught yet.
If I know where they live I get up at 4:00 am go over to their house the day of the garbage pick up and turn over their polycart. It relieves my anger and tension even if they don't know its me.
Payback is a B**ch!!