But my point is that TNE/Striker II has BOTH a Trepida (well several actually, page 98) AND a completely different "Imperial Heavy Grav Tank" (page 93) in the vehicle descriptions. They are clearly different vehicles. And the Imperial Marine Cav TO&Es in the same publication (page 142) use IHGT, not Trepida. Now, Trepidas (as opposed to IHGTs) do feature in the TO&Es of TNE/Striker II - on pages 147 and 148 - so this is clearly not a case of IHGT being used as some sort of generic longhand for Trepida, as you suggest.
The only other canon source that actually has an Imperial Marine TO&E (JTAS 12) states on page 44: "Line marine units are equipped to tech level 15 standards". All the other canon Marine vehicles are TL15. Now its possible they might have a TL14 tank with these TL15 partners, but I'd say its quite unlikely, especially given that the TL15 IHGT exists. The Marine APC is called nothing more imaginative than the "Imperial Marine Grav APC", the support vehicle is the "Imperial Marine Support APC", the meson gun is the "Imperial Meson Artillery Vehicle". It is not out-of-character at all that the tank is called IHGT.
I have been through the other references...
MT 101 Vehicles (inside front cover) introduces the TL14 10dT Trepida as "the standard issue Imperial grav tank" from its introduction in "1109" (typically wacky DGP stuff here - why would the Imperium introduce a TL14 tank in 1109??). In the same publication (page 19) the DGP crew present a far more impressive TL15 grav APC, the 13dT Empress, which they specifically associate with the Imperial Marines. In some respects this design is similar to the TL15 Imperial Marine Grav APC of JTAS 12 and CT/Striker Book 3.
MT Rebellion Sourcebook page 86 on the Trepida is the same as 101V word-for-word (both were published in 1988).
TNE RCVG page 4 states: "While Imperial forces maintained a distinction between classes of tanks-heavy, medium (called “grav,” not “medium grav”), and light- the Regency maintains one class of tank, the medium tank, now called the battle tank. Like the former lmperial medium tanks, these are simply called “grav tanks.“ [I read this as suggesting that the Trepida grav tank is the 'medium' tank of the late 3rd Imperium, just as the Trepida-III aka Norris is the medium tank of the Regency]
page 6 has the TL15 Heavy Grav Tank indicating that "it served for many years as the standard TL15 tank for Imperial Marine, Army and Guard units", although it no longer serves with Regency Marines, with Marine HGTs passed to planetary forces and replaced by the lighter Norris.
page 8 on the Trepida (and Challenge 77) supports my thesis, "In the High Stellar band, the greater number of TL14 worlds militated for TL14 vehicles rather than the Imperial TL15 absolute upper limit, and it was this consideration that made the TLl4 Trepidas the standard high stellar tank. In addition to units of the three bands above, the lmperium maintained small numbers of “top tier” units equipped exclusively at TL15. Top tier units included Imperial Marine Regiments, Imperial Guard Regiments, and other elite spearhead forces. Sector governments typically maintained
at least one top tier unit; in the Spinward Marches this unit was the Duke of Regina‘s Own Huscarles (see pages 46-47 and also Striker 11). "
page 16 describing the Imperial Marine Grav APC (which is not/not the Astrin contrary to popular belief) says "As another terminological exception, the "Imperial Marine Grav APC" carries no tech level designator, unlike most other lmperial designed vehides. This is because Imperial Marine equipment was automatically known to be TLl5, so no designator was required."
It is definitely IMHO the RCEG page 112 that is the outlier calling the Trepida a "heavy" grav tank - which it clearly is not at only 10dT and relatively light armour! The "standard" line is explained above i.e. standard in the sense that only elite units were equipped to full TL15 standards.
The only other canon source that actually has an Imperial Marine TO&E (JTAS 12) states on page 44: "Line marine units are equipped to tech level 15 standards". All the other canon Marine vehicles are TL15. Now its possible they might have a TL14 tank with these TL15 partners, but I'd say its quite unlikely, especially given that the TL15 IHGT exists. The Marine APC is called nothing more imaginative than the "Imperial Marine Grav APC", the support vehicle is the "Imperial Marine Support APC", the meson gun is the "Imperial Meson Artillery Vehicle". It is not out-of-character at all that the tank is called IHGT.
I have been through the other references...
MT 101 Vehicles (inside front cover) introduces the TL14 10dT Trepida as "the standard issue Imperial grav tank" from its introduction in "1109" (typically wacky DGP stuff here - why would the Imperium introduce a TL14 tank in 1109??). In the same publication (page 19) the DGP crew present a far more impressive TL15 grav APC, the 13dT Empress, which they specifically associate with the Imperial Marines. In some respects this design is similar to the TL15 Imperial Marine Grav APC of JTAS 12 and CT/Striker Book 3.
MT Rebellion Sourcebook page 86 on the Trepida is the same as 101V word-for-word (both were published in 1988).
TNE RCVG page 4 states: "While Imperial forces maintained a distinction between classes of tanks-heavy, medium (called “grav,” not “medium grav”), and light- the Regency maintains one class of tank, the medium tank, now called the battle tank. Like the former lmperial medium tanks, these are simply called “grav tanks.“ [I read this as suggesting that the Trepida grav tank is the 'medium' tank of the late 3rd Imperium, just as the Trepida-III aka Norris is the medium tank of the Regency]
page 6 has the TL15 Heavy Grav Tank indicating that "it served for many years as the standard TL15 tank for Imperial Marine, Army and Guard units", although it no longer serves with Regency Marines, with Marine HGTs passed to planetary forces and replaced by the lighter Norris.
page 8 on the Trepida (and Challenge 77) supports my thesis, "In the High Stellar band, the greater number of TL14 worlds militated for TL14 vehicles rather than the Imperial TL15 absolute upper limit, and it was this consideration that made the TLl4 Trepidas the standard high stellar tank. In addition to units of the three bands above, the lmperium maintained small numbers of “top tier” units equipped exclusively at TL15. Top tier units included Imperial Marine Regiments, Imperial Guard Regiments, and other elite spearhead forces. Sector governments typically maintained
at least one top tier unit; in the Spinward Marches this unit was the Duke of Regina‘s Own Huscarles (see pages 46-47 and also Striker 11). "
page 16 describing the Imperial Marine Grav APC (which is not/not the Astrin contrary to popular belief) says "As another terminological exception, the "Imperial Marine Grav APC" carries no tech level designator, unlike most other lmperial designed vehides. This is because Imperial Marine equipment was automatically known to be TLl5, so no designator was required."
It is definitely IMHO the RCEG page 112 that is the outlier calling the Trepida a "heavy" grav tank - which it clearly is not at only 10dT and relatively light armour! The "standard" line is explained above i.e. standard in the sense that only elite units were equipped to full TL15 standards.