When it comes to ligh vehicle spam, this list was an absolute killer at the LasVegasGT (or similiar list). It shows LVS can work
1 Palatine @ 192 Pts
Book of St. Lucius; Bolter; Add Celestian Retinue
4 Celestian Retinue @ [150] Pts
Bolter (x2); Meltagun (x2)
1 Sister Superior @ [13] Pts
Bolter
1 Immolator @ [65] Pts
Twin Linked Heavy Flamer
4 Celestian Squad @ 150 Pts
Bolter (x2); Meltagun (x2)
1 Sister Superior @ [13] Pts
Bolter
1 Immolator @ [65] Pts
Twin Linked Heavy Flamer
4 Celestian Squad @ 150 Pts
Bolter (x2); Meltagun (x2)
1 Sister Superior @ [13] Pts
Bolter
1 Immolator @ [65] Pts
Twin Linked Heavy Flamer
4 Celestian Squad @ 150 Pts
Bolter (x2); Meltagun (x2)
1 Sister Superior @ [13] Pts
Bolter
1 Immolator @ [65] Pts
Twin Linked Heavy Flamer
9 Battle Sisters Squad @ 199 Pts
Bolter (x7); Meltagun (x2); Mount in Rhino
1 Rhino @ [50] Pts
Storm Bolter
1 Veteran Sister Superior @ [30] Pts
Book of St. Lucius; Bolter
9 Battle Sisters Squad @ 199 Pts
Bolter (x7); Meltagun (x2); Mount in Rhino
1 Rhino @ [50] Pts
Storm Bolter
1 Veteran Sister Superior @ [30] Pts
Book of St. Lucius; Bolter
5 Inquisitorial Stormtroopers @ 70 Pts
Frag Grenades; Hellgun (x3); Targeter; Meltagun (x2)
5 Inquisitorial Stormtroopers @ 70 Pts
Frag Grenades; Hellgun (x3); Targeter; Meltagun (x2)
5 Inquisitorial Stormtroopers @ 60 Pts
Frag Grenades; Hellgun (x3); Targeter; Flamer (x2)
5 Dominion Squad @ 138 Pts
Bolter (x3); Flamer (x2)
1 Immolator @ [65] Pts
Twin Linked Heavy Flamer
5 Dominion Squad @ 138 Pts
Bolter (x3); Flamer (x2)
1 Immolator @ [65] Pts
Twin Linked Heavy Flamer
5 Dominion Squad @ 138 Pts
Bolter (x3); Flamer (x2)
1 Immolator @ [65] Pts
Twin Linked Heavy Flamer
1 Immolator @ 65 Pts
Twin Linked Heavy Flamer
1 Immolator @ 65 Pts
Twin Linked Heavy Flamer
1 Immolator @ 65 Pts
Twin Linked Heavy Flamer
Total Roster Cost: 1849
As for kill points, this list much like yours has plenty. First off it only matters in 1/3 of the missions. Probably even less if you play in a tournament.
Light vehicles are not as easy to kill as people make them out to be. They'll often be stunned, lose weapons or get immobilized before they're actually destroyed.
When you have a mass army of infantry and vehicles get close, you tend to forget about the maimed rhino's/Immo's and start targeting the healthy one's, because they're the one's that are going to cause the damage to your army.
You can have all the kill points in the world, but if you utterly crush your opponent, then it doesn't matter. You don't have to wipe them off the board to be successful. The more you kill, the less he has to damage your vehicles. Immobilizing a vehicle also adds salt to the wound, since damaged vehicles don't get you kill points. You may have 16 KP, but they're not toughness 3 Guardsmen we're talking about
Does it result as quite a game of KP denial, hiding rhinos etc. ?
Not really, it just involves using them normally to unload the cargo and then finding a proper use for them. That could include tank shocking infantry, blocking off charges, hiding in woods to prevent LOS to your forces or protecting your Exorcists. As long as your not tank shocking squads with dual meltaguns you should be fine