I think this would be a great program to play with:The Genesis Group - Trunking Network Management Software and Solutions
You are so right about this .September 26th 2006 the City of Fort Worth TX purchased the GenWatch3 Commander network management product from Motorola. Cost $164,340.00. Found this with Google.Since they won't sell it to you unless you own or manage a system, good luck getting it. Not to mention the 'government taxpayer paid' prices they no doubt charge.
Just buying the 'radio modem' is likely pretty darn expensive.