i used the triton freighter (unmodified)
cargobox:
$Name: @cargotest
$Short name: cgtst
$Species: Terran
+Tech Description:
XSTR("teeeeeeeeest", 3041)
$end_multi_text
$POF file: testingcg.pof
$Detail distance: (0)
$Show damage: YES
$Density: 1
$Damp: 0.2
$Rotdamp: 0.2
$Max Velocity: 0, 0, 0
$Rotation time: 20, 20, 20
$Rear Velocity: 0
$Forward accel: 0
$Forward decel: 0
$Slide accel: 0
$Slide decel: 0
$Expl inner rad: 100
$Expl outer rad: 300
$Expl damage: 300
$Expl blast: 500
$Expl Propagates: YES
$Shockwave Speed: 0
$Default PBanks: ()
$Default SBanks: ()
$SBank Capacity: ()
$Shields: 0
$Power Output: 0
$Max Oclk Speed: 0
$Max Weapon Eng: 0
$Hitpoints: 800
$Flags: ( "cargo" "in tech database")
$AI Class: none
$Afterburner: NO
$Countermeasures: 0
$Scan time: 2000
$EngineSnd: -1
$Closeup_pos: 0, 0.9, -300
$Closeup_zoom: 0.55
$Score: 0