I'm pretty sure they are mostly on MOSWIN. I'd just pick a site closest to you and program the dispatch TGs in. The car TGs are "Car to Car" and are rarely heard. You will hear both sides of the conversation with ease. Depending on the scanner you have, you can just program the control channels in your scanner (highlighted in red).
In the Troop A area I hear both Troop A Dispatch 1 and Dispatch 2 since they both are metro and rural respectively. Troop H, on the other hand, uses just Dispatch 1 til they have to hold the air for any reason then they switch to Dispatch 2.
NWS Storm Spotter
Scanners Include: Uniden BCD996T & Uniden BCD396XT