Now we can all throw away the Italeri kit that has lurked in the back of the stash for the last decade or so...

Actually, the Italeri kit is a ZiS-151 truck, while the Trumpeter release is on a Zil-131 truck, so they're not exactly the same (apart from the rocket launcher of course). Hobby Boss has a ZiS-151 variant (BM-13N) which would be closer to the Italeri release, but that was released 5 years ago (still a good kit and I suspect Trumpeter launcher part is based on those sprues). ICM has a version on a Studebaker US6, while Zvezda does a Zil-157 version. I believe there's even a Zis-5 version from Ark Models or some other eastern manufacturer, but these are all old kits and not up to modern standards, like Trumpeter or Hobby Boss.