As I wrote in my tweet earlier today, I was reading the very good information in the SVG "Whats What in Mobile Production" survey, which admittedly is focused on the larger fleet operators, and that the PMTV TV Truck database currently has 146 multicamera HD Mobile units on file. Then again we track TV TRUCKS voraciously as it's our inventory knowledge per se, and our database includes all viable units that can provide our clients with a best solution. Not all HD shows need $10mil solutions (build price not rental price hahah) so even a 30' "Industrial" HD level gear truck has a value to certain projects.
p.s. our "SD/Analog" truck count is a staggering 338 mobile units of every size/shape/vintage/power for a total HD+SD+Analog "fleet" of 483 TV Trucks in North America..