Hm, even though you are not as independent from logistic limitations and that carrier won't even survive a single counter-battery salvo by a thumper.
To be honest, I would rather pick one of the above, than two of the carrier variants, especially since the latter would occupy two heavy vehicle slots on a dropship.
Though for defensive operations on some backwater planet that carrier adaptation might be good choice.
btw, same concept just with Arrow IV:
A4 Artillery Vehicle
Mass: 70 tons
Tech Base: Inner Sphere
Motive Type: Tracked
Rules Level: Experimental Tech
Era: Dark Ages
Tech Rating/Era Availability: E/X-X-F
Production Year: 3088
Cost: 3.531.440 C-Bills
Battle Value: 1.146
Power Plant: 210 Fuel Cell Engine
Cruise Speed: 32,4 km/h
Flanking Speed: 54,0 km/h
Armor: Reactive
Armament:
2 Arrow IV Missiles
1 CASE
1 Cargo, Liquid (2.0 tons)
================================================================================
Equipment Type Rating Mass
--------------------------------------------------------------------------------
Internal Structure: Standard 28 points 7,00
Engine: Fuel-Cell Engine 210 11,00
Cruise MP: 3
Flank MP: 5
Heat Sinks: Single Heat Sink 1 0,00
Control Equipment: 3,50
Lift Equipment: 0,00
Armor: Reactive AV - 128 8,00
Armor
Factor
Front 33
Left/Right 32/32
Rear 31
================================================================================
Equipment Location Heat Spaces Mass
--------------------------------------------------------------------------------
2 Arrow IV Missiles FR 20 2 30,00
CASE BD - 1 0,50
Cargo, Liquid (2.0 tons) BD 0 1 2,00
@Arrow IV (ADA) (5) BD - 0 1,00
@Arrow IV (Inferno) (5) BD - 0 1,00
@Arrow IV (Th-Act) (5) BD - 0 1,00
@Arrow IV (Cluster) (5) BD - 0 1,00
@Arrow IV (Homing) (20) BD - 0 4,00
BattleForce Statistics
MV S (+0) M (+2) L (+4) E (+6) Wt. Ov Armor: 3 Points: 11
3 1 0 0 0 3 3 Structure: 2
Special Abilities: ARTAIS, CASE, EE