Here in Kasson, the sewer rats grow BIG. Some are said to be as large as buffalo!
This cache is almost exactly the same size as the typical American Bison 
If you park right at GZ, you should be able to grab the cache AND have some pretty grate cover so you're not spotted while grabbing it. While you're in town, be sure to HANG OUT and grab as many caches as you can!
GOOD LUCK!