It came to me the Savannah Master as an OmniHovercraft would make an effective BA Carrier. It's fast and cheap, and gains a little more utility as you can swap out equipment.
Only a single Ton of Pod Space though, so choose carefully. Probably not enough room for any meaningful Infantry.
Omni Savannah Master Hovercraft (Prime)
Mass: 5 tons
Movement Type: Hover
Power Plant: Edasich Omni 25 Fusion
Cruising Speed: 140.4 kph
Maximum Speed: 216 kph
Armor: Bowie Glinting Blade Reflective
Armament:
1.0 tons of pod space
Manufacturer: S.L. Lewis, Inc.
Primary Factory: Carlisle
Communication System: TharHes Hm 10
Targeting & Tracking System: TharHes Alpha-2a
Introduction Year: 3105
Tech Rating/Availability: E/X-X-F-E
Cost: 210,833 C-bills
Type: Omni Savannah Master Hovercraft
Technology Base: Inner Sphere (Advanced)
Movement Type: Hover
Tonnage: 5
Battle Value: 294
Equipment Mass
Internal Structure 0.5
Engine 25 Fusion 1
Cruising MP: 13
Flank MP: 20
Heat Sinks: 10 0
Control Equipment: 0.5
Lift Equipment: 0.5
Power Amplifier: 0.0
Armor Factor (Reflective) 24 1.5
Internal Armor
Structure Value
Front 1 10
R/L Side 1/1 6/6
Rear 1 2
Fixed Equipment
None
Weapons
and Ammo Location Tonnage
ER Medium Laser Front 1.0