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.