You should seriously consider getting a RTL SDR dongle and a SDR program such as Unitrunker or DSD+ Fastlane, to log/monitor a particular site and see how exactly things are being patched in your area over time. Basically Denver Dispatch always maintains several patches between numerous talkgroups within their coverage area, the patch combinations change randomly with no obvious pattern. As a general manner, individual troop talkgroups (i.e. 1-D West or East) never operate in isolation except on rare occasions during critical incidents as previously mentioned.