That reminds me - - what was the new 'mini-DOW' thing? It wasn't far from the TIV when we saw it ... just wondered who it belonged to. Kind of looked like "honey, I shrunk the DOW."
We have several radars out with our group ("our" being Howie Bluestein and his graduate students) -- two from the University of Mass. at Amherst (a relatively small W-band and a larger X-band), and the MWR-05XP mobile phased array (which is on a large truck platform). We, however, don't have any "support" vehicles, so you won't find us as part of a caravan (unless we're behind or otherwise injected into "the" caravan). The trucks are marked as either UMass / MIRSL or ProSensing / Naval Postgraduate School. The W-band (which operates near 95 GHz) is actually a cloud-sensing radar, but we (in particular, Robin T., since she often operates it) use it to scan tornadoes, wall-clouds, etc, given its extremely high resolution. The X-Pol antenna is smaller than the DOW's and is mounted on a smaller truck, so that's probably what you are referring to. The people who operate and help with these radars (myself, along with fellow Stormtrack'ers Dan Dawson, Robin Tanamachi, Mike French, etc) have been chasing for a while... We make every effort to pull completely off the road and only deploy where others can pass by safely. If you notice "stupid driving" behavior with these vehicles, please feel free to PM me to let me know.
I post this to caution against generalizing the various mobile radar research groups too broadly. FWIW, we also ran across some stupid driving behavior by some in the Discovery Channel convoy (doing K-turns on a relatively busy highway, completely blocking traffic in both directions, etc), but it sounded like another vehicle in their convoy called them out for doing so, which I was very pleased to hear. There are also some very experienced chasers in the Discovery Channel / DOW armada, but there are a lot of vehicles that are largely just production folks that have little chasing experience.
EDIT: I'm not saying anyone is "calling out" our group -- I just wanted to explain our radars and the folks who work with them a bit.