Here are a few grav-vehicle & gravitics related articles from various Traveller-specific magazines:
Alien Star:
AS-008: grafmetz luxury gravcar, bergor aircar, assault sled (vehicles)
Between Worlds:
BW-004: grav raft (vehicle)
High Passage:
HP-002: vehicles: grav apc, ah-15 aggressor attack helicopter
HP-004: grav mining vehicle
Imperium Staple:
IS-004: ship grav landing (gravitics, grav drives)
IS-004: the physics of grav units & plates (gravitics)
IS-007: a matter of gravity (gravitics)
Jour. Travellers Aid Society:
JT-012: grav-assisted atv, submerible atv (equipment/vehicles)
JT-019: equipment: parachute, parawing, gravchute
Starships, Starports & Veh.:
SSV-002: holy wind class solomani combat lander (grav-vehicle)
SSV-003: screaming eagle solomani gravtank (vehicle)
SSV-004: san antonio grav fighter (vehicle)
Traveller Digest:
TD-006: equipment: grav belts
TD-020: affordable transport, pt2 (designing low-cost grav vehicles)
Third Imperium:
TI-003: inside equipment: grav belt (equipment detailed)
Terra Traveller Times:
TTT-013: m371 grav-powered mrl (artillery vehicle for 2300ad, weapon) [hh]
TTT-022: dethenes class grav tank (vehicle) [hh]
Working Passage:
WP-000: solo scout craft (gravitic flycycle variant)
Hope this helps.