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That's an interesting theory. I'm even willing to accept most of it. 
Save for the fact that the second filler cap appears on my photos of the MARSOC GMV (GMV-M). No idea really what it's for at this point. Possibly a reservoir for dampening oil in the add on shock dampeners? That doesn't seem likely, but it's all I can think of at the moment.
Is the GMV-M based on the new hull with the side grills or the earlier hull design?
Also, I feel that now is a good time to explain the components of the LTAS A- and B-kits, since that seems to be causing some confusion here:
The A-kit consists of:
- Wheel well and under body armor
- Rocker panel armor
- The "shield" at the base of the windshield
The B-kit consists of:
- Up-armored roof
- Up-armored windshield
- Up-armored doors
- Up-armored B-pillar (2-door configurations only) or C-pillar (4-door configurations only)
- A-, B-, and C- pillar IED overlays
The revised clamshell can be fitted when the B-kit is fitted to 4-door configurations. The up-armored doors come in two flavors. One is similar, but not identical to the standard M1114 doors, and the other is similar but not identical to the M1151/M1152/M1165/M1167 Frag 5 doors. The Frag 5 doors can be substituted for either. Supplementary Frag 1 IED overlays and Frag 2 wheel well armor can also be fitted in conjunction with the B-kit (these Frag kits are referred to in the Operator's Manual as "Enhanced" as they are placed over the existing A- and B-kit armor).