Yes, all of those. What are the several models? Which ones fit? Are some of those names actually the same tow bar being called different things?
At least as they apply to LMTV/FMTV. I just can't seem to find a concise explanation of them. For example, if someone could say:
There are 3 main tow bars that an FMTV owner would be interested in: The medium, the IBIS, and the heavy duty. The small tow bar is only for HMMWVs.
Medium - this is the one commonly "issued" with the LMTV, it is the lightest total weight of the 3, but is difficult to work with be you mostly have to move it around assembled.
IBIS - IBIS stands for Ixxxx Bxxxx Ixxxx Sxxxx, and is a modular medium tow bar with components to fit FMTVs and other vehicles too. It's nice because it's longer than the medium, but has a lot of parts.
Large - The large tow bar will also tow HEMMTs, and weighs 2x the medium. The nice thing is it comes apart easier, so it's easier to assemble on a vehicle by yourself. They tend to cost less too.
Something like that. I obviously made all that up, but if you have a lot of experience with tow bars, I assume that's straightforward to lay out.