Pardon me for needing to sleep, and having a sleep cycle off from the local daylight. My local PD replaced their stepvans with MRAPs when the US Army started selling MRAPs Surplus. You seem to be thinking that a "SWAT truck" is a Lenco Bearcat: This beast is 'only' 18,000lbs, but doesn't have the cargo capacity to carry a TAG. Here: What's that big truck on the far right? Hey, it's a Stepvan of some flavor. While that particular one looks like it's been modified for Command Post duties, I've seen lots of others that are a large cargo box, usually stuffed full of the various specialty gear that SWAT teams (or the riot squad) may need.